I would love to see Christopher Nolan tackle the Daredevil and Punisher franchises. Both are real world character, with real world villains, just like Batman. Punisher is definitely a dark character, and while Daredevil can be family friendly, he can also be a little dark. This is probably never going to happen though. I doubt Nolan wants to become the guy who reboots comic book movies, even if the final products are awesome.
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