What would BATMAN BEYOND be like in the nolan-verse.
Personally, I think this is the best course for Warner if Nolan does make the third movie his last. Warner could still have Batman out there, but they wouldn't immediately try to take over Nolan's vision and possibly hack off his fan base. The old man Wayne may even be a hook to keep Christian Bale involved; it's a kind of role I don't think he's tackled yet.
In any case, I remember reading somewhere that a live action Beyond was the idea until Nolan's idea for Begins supplanted it. If Beyond has been seriously on the table before, and then Warner should realize it could be successful.