Personally, I think Ganondorf is a fantastic villain. I just want the series to do something new with him. I wanna hear his backstory, I want him to be developed much better, and I definitely do NOT want him randomly thrown in in the middle of a game that already has an antagonist. -coughtpcough-
I don't want Ganon, either. He can be his own boss, but I don't want the evil man Ganondorf being thrown out for some mindless beast. I love hearing Ganondorf talk, I just wish it wasn't all BLAH BLAH WORLD DOMINATION BLAH.
If we get a new villain, though, I don't want some evil mastermind that wants to kill Link and rule the world/triforce/whatever. If we get a new villain, I want something like Skull Kid. Skull Kid (at least, under the influence of
MM) didn't want to rule the world--he wanted to destroy it. The antagonist wasn't some evil wizard, it was a truly sinister force of evil. Now why can't we have something like that?
In short: Better Ganondorf or something REALLY unique and evil.