The Dark Knight Rises would happen.
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LOL you know, he probably does have a secret back-up fortune. He keeps it in the same vault he stores his back-up Robins in.
He'd become Daredevil.
Isn't the premise of Daredevil is that he's just Batman with a hell of a lot less money?
"Mistah Joker, he dead."
He would make his money back. Right away. Dudes like that don't stay down. I don't mean determined super-heroes...I mean billionaires. The system is rigged in their favor.
He might be...gasp...only a multi-millionaire for a couple years.
The white crow who disturbs the convenient silence...
He'd probably do what the Punisher does. Not the killing part, but seizing drug money occasionally to fund his activities.
Life looks better in black and white.