Fantastic Quora question and answer: Superheroes: Given our current technology and with the proper training, would it be possible for someone to become Batman?
The genius of Batman is that it pretends to be realistic, it lets us convince ourselves that with enough money and training, we could become Batman, too. But it's still fantasy, it's just a fantasy that is more compelling and convincing and thus more fun.
Hat tip to Shawn Blanc.