Re: How long should the new series go on for?
I kind of like the idea of a loose Bond type continuity that lasts forever because it would lend itself to a more "episodic" presentation but is that really the best route for a film franchise? Don't we want some type of arc? Or is everyone just perfectly content with turning the series into Batman: The Cinematic Adventures?
I think the best way to do it is how they're doing it now. Every few years or so a new creative team swoops in and re-imagines the mythos. Similar to how every few years a new artists pens Batman. Otherwise you risk running the character into the ground. And I don't think the writers should be slaves to continuity.
I am open to a live action television series though. That would be insane. Then you can do season long arcs and stand alone stories in all their glory.