Location: Arlington, Virginia
1) I doubt Nolan would stick around to produce something like that. Soon the creativity will be drained, and Nolan won't be able to contribute anymore.
2) Warner Bros might actually push forward with a reboot, since they lost one of their biggest franchises (Harry Potter).
3) However, if TDKR ends the trilogy with a bang, the possibilities of a reboot will decrease, since there will be absolutely no reason to reboot and earn nearly as much money. For example, Raimi's Spider-Man 3 came to an unsatisfying ending, and even though it earned a significant amount of money, people wanted more, because they thought a reboot might be better than the third installment.
4) Studios want money, but won't they be scared that the HUGE Nolan fanbase would boycott a reboot? Thus not earning nearly as much money as Nolan's Batman.
Just my two cents.