I'm not against change, and I do like tdk trilogy, but I think Batman works best in a unrealistic world. I prefer movies where you can take a break from the real world and experience something unusual and exciting. King Kong would not be special if Kong was just a rabid chimp running around New York and strangling people. Or imagine a Star Wars movie about astronauts punching each other in the face onboard a space shuttle.
I don't think Batman is very realistic. A man couldn't be a master in all the martial arts in the world, when it takes almost a lifetime to master just one. But in a fantasy world, it can work