Well, to be honest I have mixed opinions about the Nolanverse. I thought the movies were decent, but I didn't think they captured the essence of Batman from the comics very well.
"The Dark Knight" benefitted from the hype generated by Heath Ledger dying. It being a good movie of course helped it's performance, but you can't underestimate the influance that had on it.
The third "Nolanverse" movie doesn't have anything so attention getting in it, and a lot of the changes to the characters we're seeing continue to demonstrate how far out of context Nolan has been getting with "Batman". As he hits his third movie it's becoming increasingly difficult to see any real connection between the characters in his movies, and the comics they are supposed to be from. Bane and Catwoman seem to largely just be action movie cliques, albiet probably well done ones, that are carrying the names of popular comic characters.
As far as a Lazarus Pit goes, that would be awesome, but truthfully I don't think it fits with the Nolanverse because it would have been a factor much earlier on. He'd kind of have to retcon the first movie to some extent, and something like that would definatly play havoc with his attempt to do this with very human seeming characters.
Truthfully I think these movies will be remembered fondly, but that nobody has yet to really do the definitive live action "Batman".