You raise a few good points Grevious, but i dont think that this is the end of the batman line just yet.
I think the biggest problem lego has is the fact that they released so many sets in the first year of this theme, i cant remember when a license was so heavly produced in its first year.
The thing with the batman is that theirs alot of different vehicles that lego can reproduce if they want, so we could in theory get a different batmobile each year if they wanted.
As for the new Batman cartoon well who knows but i would be surprised if lego touched that series, even though its just been renewed for a fifth season the show has its critics and i cant see lego spending the money to create the many different figs.
Sure lego do different types of SW figs but they reuse most of the fig heads but if they did the batmans new show they would have to make the figs all over again and thats not something lego likes to do.
I would welcome sets based on the new show but i doubt it somehow.