Didn't TDKR nearly make a billion worldwide, while TDK did make a billion? All three films did great. The more serious tone fit the character; modern Batman is quite serious, some of his best source material is mature, etc. I'd love to see a gritty, dark Daredevil film for instance, but Superman and most other characters should not be Nolanized.
Superman is a shitty character and most Superman films suck, come at me. He's not particularly popular today and I doubt this film will change that.
Another thing this tells me is that DC can't compete with Marvel in terms of superheroes. All they have is Batman, I don't see any of the other JLA having huge films like Thor or Captain America. Anyone want to see a Flash film? What about Wonder Woman? Martian Manhunter? The characters are boring thus leading to forced semi-comedies like Green Lantern. And without Bale as Batman what's the point of a JLA film.