lazarus
Blue Crack Supplier
Possibly. The thing I like the most about the Nolan series is that it pulls from so many different sources or storylines without adapting one singular text - a little Dark Victory/Long Halloween here, a little Killing Joke there, and so on. If something like TDKR were to happen, it would have to be after the DC Universe has asserted itself as a viable film series. I can't imagine it without the presence of Superman or Green Arrow, but you'd have to have it fit their chronology as well.
Plus, it was the best title I could think of for that particular film, which is by no means definitive.
DC still owns the Miller property, so a straight-up adaptation is always a possibility. Of course, the current series would have to finish its arc (I'm not sure how many films Bale was signed for, but I doubt he would have agreed to more than four), and like you said, a fleshed-out DC Universe would help. Unfortunately, there haven't been a lot of great DC movies to accomplish that. Their Superman reboot (which I thought was decent) was considered a failure and all the principal cast/crew are not returning. Who knows what the status of Wonder Woman is, the Green Arrow project doesn't look very interesting, and Ryan Reynolds as Green Lantern gives me a little pause.
Of course, the animated DC stuff seems popular and well-done, but is that going to translate to the general public knowing these characters? I still think it could be very successful, but at this point I'm not sure there's an older actor that would be good for this.