Originally Posted by JackWhite
Not to derail the thread, but I think had Heath lived, that's how they would have used the Joker in TDKR. Soon as Bruce makes his return as Batman, the Joker wakes up from his years-long catatonic state, just like how it played out in TDKR graphic novel.
As much as I love that Dark Knight Returns idea, I can't see it in this movie verse because I cannot fathom Joker slipping away into a comatose state knowing Gotham is thriving on a lie about Harvey Dent that is stopping him from winning the battle for Gotham's soul.
He wouldn't sit by and not try and do something about that. That was his ace in the hole.