He could fall through a skylight.
Maniacal Laugh, Maniacal Laugh, Maniacal Laugh
Again though, I don't think the message of the movie(s) is that anyone can be Batman. As it was said, the Batman is just a symbol. Something everyone can rally behind. Being a hero doesn't mean that you end crime in your city. It can be (blatant stealing here) putting a coat around a little boys shoulders and telling him it isn't the end of the world. It's all relative. Being good. Doing good things. That can be heroic if your whole city is infested with bad. You don't need a billion dollars for that. Nolan was using Batman as a light at the end of the tunnel for people in Gotham. He wasn't there to rescue everyone as much as he was there to let people know that help was there and that not all was lost.
That isn't to say you can't have valid criticisms about the narrative or style or (ahem) lack of joy in the movies. Those are all perfectly within the realm of fairness. Sometimes things just don't work for everyone. I loved Avatar. I know one or two folks that didn't. I can't find one redeeming thing about Children of Men (speaking about lack of joy) but I know some that think it's the best thing ever. To each their own really. I just think you guys are too deep into the "realistic take" thing and not really seeing that it's about as realistic a take as you can get on a Batman story. The fact is though, you can't eliminate everything in the realm of the impossible.
Here's my final (heh yea right) take on it....
I'm choosing to believe that Warner Brothers probably had a laundry list of requests and demands and Nolan made the best movie he could around them.
I have no evidence or any good reason to believe this... but I do anyway.