Wait it out, or Pull the trigger?

i m holding everything till next update.

I'm waiting simply because I don't have any pressing needs. I have all the attackers and defenders that I currently need. I have just been spending my stardust to power up my pokemon coming back from the gyms since I leveled up. Only 2 Vaporeons and a Donphan holding out on me. After that I figured I would wait for the gym rework...or level 38, whichever comes first.

I currently mostly just power up all my defenders when they come back from a gym.

It really depends on your needs, if you already have a B/SE or B/C T-rex, maybe you don't have any needs to evolve one...or if you have enough defenders, you can live without getting more.

I am also evolving decent/high IVs of mons with good movesets just in case moves change again (like RT/SE or RT/RB Golem or ES/SoB Exeggutor).

Golem is probably the most unique case with double Rock moves.

I used to be the same, power up and live for today. But the past 3-4 weeks been saving all my dust and candies collecting good IV mons to evolve it a gym rework happens.

If it doesn't happen by the end of June (they promised a major update each quarter) then I'm going all out again and blowing my dust. I have high IV Chansey and Larvitar ready to evolve but if there is major rework I might think twice.

I also wonder if there will be any more CP/stat adjustments to balance out (buff/nerf) some of the mons like they did with Gen 1. I'm curious if something might happen along with the gym rework.

What if some mons are nerfed by new movesets? Then you would regret not evolving some while you had the chance.

Dragonite got improved with DT/O or Hu, but I still prefer DB/DC. I wish I had evolved more Dragonites back then.

What is the official evidence that a gym rework is coming? There are many questions posted that ask about waiting for the gym rework, but until there is an official announcement from Niantic, I don't believe any speculation I read. Will it ever even happen? Will it be a year from now? Will it make your Pokémon better or worse? Since nobody knows anything, I continue to play the game as it's designed for today.

I'm doing just enough to keep mons in just enough gyms and just high enough to stay out of the "shave" zone.

But I'm so ready to pull the trigger.
I have almost 1.7M dust and lots of evolve candidates with stockpiles of candy for many many mons.

The ideal scenario is:

1. You have all relevant attackers with high IVs and perfect movesets for the current meta. You may also have a couple of spares for trading, if trading comes out.
   --> If you do not, you need to evolve now to get them for protection against the possibility that great attacking movesets become legacy. Eg, DBDC Dragonite.
2. You have sufficient defenders to collect a regular income of 100 coins per day. (Or whatever is max for your local gym scene) You may have some spare trade-worthy defenders for trading if trading ever comes out.
   --> If you are not collecting max coins daily for want of enough defenders then evolve now to get the number of defenders you need to get you max coins.
   --> But if you have too many defenders and not enough gyms to put them in, save your dust and candy by not powering them up.
3. You should also target having a number of meta relevant defenders with the so-called best movesets. For example, ZHDG Blissey.
   --> Currently for defenders CP is more important than moveset, but just in case the gym rework prioritises movesets, you're covered.
4. Next, hoard candy for all current meta relevant mons to the best extent you can. If you've got steps 1 to 3 above covered, you should be fine and you should be looking forward.
5. For non meta relevant mons, do some research to see what current mons might possibly be good in Gen 3, eg Rock/Rock Golem. Aim to get at least one evolved form with good IVs and movesets now, just in case good moves become legacy.

Same, I'm up to 600K dust, most I've ever had. Every time I get tempted to spend some on an attacker, I manage to resist. I will bump up all my defenders when I reach level 35 in a week or so, but that's it.

I am evolving here and there, with the intent of generating good future defenders in as many types as possible, in case the gym rework forces some sort of diversity. For example, I caught a 96% level 26 growlithe this morning, and checking his current movesets, figure that they are all decent for defense, so I evolved him and got Snarl/Crunch. I'm good with that, as attacker choices into Arcanine, are typically resistant to fire as well. There he will sit, though, not powered up any more until we know what the gym rework brings, even though I would love to max him and stick him in a gym right now, just for some diversity!

I haven't changed my evolving/powering up process because of a possible gym change. I continue to evolve and power up pokemon as I normally would. There will always be changes. When they actually come, I will know what to do to adapt, rather than guess or fret by worrying about what they might be. If something I powered up or evolved gets nerfed, it won't be a disaster. If there are new, better movesets, I'll simply seek them out just as I did for previous ones. If you inhibit yourself every time a potential change could occur, you lose the enjoyment of playing the game the best it can be at the present. Honestly, you'll screw up the fun of playing if you halt waiting for every rumored change.

Right now, I'm exclusively powering up my best of each of the big 7, and leaving my other defenders around ~2800ish CP (since that's usually enough for fringe gyms in my area).

I think it's highly unlikely that the pseudo-legendaries (Dragonite & Tyranitar) will get nerfed beyond usefulness in any coming gym rework, so I'm walking a Larvitar to hopefully get another shot at a B/SE TTar before any moveset shakeups happen. I figure having a good Rock attacker will be necessary if the Legendary Birds show up on the gym scene in any capacity.

I think keeping up with CP creep on a few mons for the trickiest-to-hold gyms and stockpiling things otherwise strikes a nice balance between playing for the now and the future.

I'm doing a little of both...

I've got a few evolutions of non-critical pokemon that I'm going to pull the trigger on, since they're not likely to be super-relevant even post-rework (unless we get far more than we bargained for), and I'll do them under a lucky egg for exp since they're things I don't have yet (houndoom if I can find one more, for example).

On the other hand, for things that are both battle relevant, and which I don't need, I'm holding out. Things that I do need, I'm not holding back on (for example, any drat candy I score is going straight into my 'nite so I can get something that competes in gyms that get shaved).

One question to think about is - what do the current movesets look like? Is it something where the current movesets are good, hence will be likely stay decent (with previous rebalances, they generally haven't turned great movesets into trash or vise versa)? That would speak in favor of evolving now. Or is it something where the mon has good typing/stats, but is held back by sub-par moves, such that any change in what's available would be likely an improvement (ex, kingler, scizor)?

I was waiting for a loooong time, but when I reached level 37 and saw I had 1.8M dust, 275 Larvitar candies and a 100% Rhydon on level 6 since a lot of time ago, I could not resist anymore.

Evolved my first Tyranitar, got B/C, maxed him out, and maxed out my Rhydon, now I went down to 1.2M dust and spent some candies on my top tier ones (maxed when they came out from gyms as I just leveled up), I don't regret, they are all back to gyms today and I am slowly recovering from the investment, I am pretty sure I will reach at least 1.5M before the gym rework comes, even more probably.

So my advice is save it only if you don't have something "amazing" to actually evolve and power up, if you are high level and have a good amount of attacker and defenders or you are far away from your next level up.

If not you can invest some and continue saving afterwards, knowing that there is an event coming I would say that gym rework would probably come by the 1 year anniversary so still a month to go, who knows, being Niantic probably even more, they still have some type events that can potentialy throw at us before, like an Electric and a Fight/Dark one, that would distract a bit from their delays on the actual content updates.