Re: The Joker - What would you do now?
I think that TDK was implying that Joker and Batman would definitely meet again and that he would always be the arch-nemesis. "You and me... I think we're destined to do this forever." If there was a really good role for the Joker to return, i would be for him being recast, since there is already a precidence of recasting with Rachel Dawes.
Holmes, though, didn't own the character to such critical acclaim that people spoke out in horror when the character was recast.
Out of hope.