They killed off Harvey Two-Face and with Heath Ledger gone they can't make a Joker movie to follow up this one. I assume they'll give it another go because it's so fucking lucrative at this point, but what villain will they choose? Mr. Freeze, Cat Woman, Riddler, Poison Ivy? While the "it's been done" didn't stop them from re-doing Joker... I just can't see where they'd take it from here.

Also, yeah... given the parameters you did... Ledger was the better Joker.