Lol should Niantic implement a Max Repel?

Lmfao, ? Not the catch'em all guy?

Honestly, when you get higher in level, you start throwing at Pidgey's like you do at Dragonites. You need all that XP, lol. I remember Central Park was a Electabuzz nest, that was the worst.

Not possible.
Spawns are global. What you see is also what others see. Blocking spawns would affect other players that could want the spawns that you don't want.

What could be done is a incense without the common pokémons. Or a incense with increased rate of rares.