Will Lugia Disappear Too?

I think just have to assume it will. If you still need a good Lugia or Zapdos, then try to get it this weekend. And don't wait till Monday, because there were not a lot of Moltres raids where I live on its last Monday.

Don't think they will. Disappear. Most likely sill available but very rare.

I think Lugia will still be available after Tuesday. It would honestly surprise me if they just removed it without any sort of announcement. It would also make many people upset. I think they should always have 5 star raids available to an extent.

Probably safe to assume it will disappear...I think the "Legendary Raids" were part of the Go Fest event and it will go when Zapdos leaves...

Same for the discount boxes...

We probably will get new Tier 4 raids next week, but I think all Legendaries will be gone since they will keep Legendaries as "Legendary".

The other thought is t5 raid are here to stay and these 4 legendarys will cycle through for a bit longer. Month or 2 atleast. Niantic has made more $$$ off raid pass sales and lucky eggs in the last 30 days than they made in the previous 6 months of game play. the t5 raids have revitalized the game for the time being.

I imagine that even in the Niantic offices, there's debate over whether it's better to ride that raid pass cash as long as possible or dial things back so that there's more excitement when they roll out more. If they keep all the birds in rotation, then when the Mews and the dogs come out, it won't seem as urgent to catch them and raid pass sales could lag at that time.

As for Lugia, I suspect that they'll keep it going — especially since she has a reputation as being a tough battle. It'll give trainers a raid to aspire to.