Why couldn't they make another? The villains in the Clooney/Kilmer Batman movies don't count, because those movies were tragedies and shouldn't be considered official Batman movies. This is like a totally new series... they could introduce a great Mr. Freeze in the next one. He's actually one of my favorite Batman villains, and no one does him right: he's not good or evil, all he cares about is his frozen wife.
I hate when villains show how 'evil' they are by killing someone for no reason, just so the audience knows they're the bad guy.
Henchman: I'm sorry Mr. Freeze, Batman got away! I won't let this happen again!
Mr. Freeze: I know it won't. Your assets have been... frozen. *pulls out ice-gun*
Henchman: Noooooooo! *dies*