Re: How long should the new series go on for?
They should definitely go the James Bond route. The cold war ended in the early 90's and Bond was still able to remain relevant for another decade before it became stall and irrelevant in desperate need of a redefinition. To throw away old conventions, create some new, while still letting the character shine. The difference is James Bond was created around a certain geo-political climate, Batman on the other hand has a much more contemporary concept that can always place him in a modern world. If they focus on making one great stand alone film at a time, don't rush new stories and characters, and don't jump any sharks they could do a continuous Batman film series for a long time.
They'll be good films and bad ones but it will be a more substainable business model void of unnecessary reboots retelling the same story.