The thing that i am most afraid of is that a common ground of balance will never be reached. I guess that is understandable since you cannot please everyone, but; popcap will most likeley be in a vicious cycle of dettered balance, nerfing/buffing one character and that in turn makes him too weak/strong, forcing them to rebuff/nerf and you can probably see what happens there. To be entireley honest, every character, if played RIGHT, is powerful. With the exception of frost rose. And i know i am playing devil's advocate here but i would say that with enough practice and mastery, you can wield 85% characters with power.
