Its not fair to compare because 89 stands absolutely zero chance. Nothing about it touches Dark Knight in anyway.
And they are two different franchises.
The Dark Knight is not a remake or rehashing of 1989’s.
Tim Burton’s films were dark and sinister, but still had that comic book feel. The Joker falls into toxic chemicals, "disfiguring" his face into a
perfectly symmetrical smile. And his weapons, while deadly, looked and functioned like cheesy props – like the boutonniere that squirted acid.
No problem, though. Burton pulled off what he set out to accomplish, and it was a great movie.
Nolan is telling a different story. His Joker is not an evil clown, but a deranged, psychopathic terrorist who just crudely slapped some clown makeup on more as a form of war paint. No special weapons or purple suits. The character – as well as the entire movie – seems more realistic.