Director and star may be finished, but DC and Warner Bros. certainly are not. The Justice League looks to be the next film after Zack Snyder's Man of Steel, and is tasked with both introducing new heroes, and (according to reports) rebooting a new Batman movie franchise. While Nolan loyalists may claim the odds are stacked against the next actor to put on the cape and cowl, we see opportunity.
There are some major elements of the Batman character and comics that Nolan completely avoided, and were largely under-represented in past movies as well. If the next Batman films were to tackle those themes and angles, comic book fans could be in for a treat.