You know what cracks me up? Every time someone says something like "Catwoman is white, Spider-man is white" people go "Hmmmm that guy must be racist if he thinks that way!"
Okay, so what about we make Shaft with a white guy cast as the main character. Would it be racist against white people to say "No way man, Shaft is black!" No, no it wouldn't.
What if they make a X-Men movie and make Storm white. Would it be racist to say thats a bad idea? No.
What if they rebooted the "Steel" movie that had Shaq playing the lead and they cast a white guy in the role? Would that be a good idea? (Well, maybe remaking the movie wouldn't be a bad idea, but Steel is a black guy so he should have a black actor playing him.
What if they remade the Blade films and cast a white guy as Blade? Would it be racist to think its silly to do that? No it wouldn't. Blade is black.
So why is it instantly thought to be racist to want a white character to be played by a white character? It's silly to me.