Just this week I rewatched Batman Begins and The Dark Knight after getting my Armory set. Those films are so incredible, especially TDK that I don't see any reason for HT not to keep making figures from them. There will always be new entrants into the hobby who want a Joker and both Batman outfits, why not give it to them? If HT released a new TDK suit Batman tomorrow that was an improvement on the Armory set... then I would simply sell off my Armory Batman and almost certainly make enough to buy a new one. As for Begins, the last release of that suit was three years ago, longer now than between the original release (MMS67) and the TF release.
I also think they should release a new Joker because none of the official HT releases match the best customs. We could do with a Joker with rooted hair (if nothing else to be able to hang him upside down - that was nothing if not an important scene) and of course a DX could include a nurse outfit and wig.
Apologies if this upsets anyone.