On one hand, the Bond movies have drifted so far from the tone of the original Fleming stories that you could probably have a transgendered Inuit paraplegic play the lead character and get away with it.
On the other hand, the character Fleming created was a composite of himself (not a black guy) and a dozen or so folks he knew of in the spy trade (none of whom, as best I can tell, were of anything other than the Caucasian persuasion):
http://en.wikipedia.org/wiki/Inspirations_for_James_Bond
I’ve grown tired of the Bond franchise. They’ve done about all they can do with it IMO. The only thing that would interest me would be a Bond set in the 50s during the Cold War. They could even do new versions of some of the books that were buggered first time out, like Moonraker.