And if you mean the title character, you are presupposing that:
A. the quota existing means Bond won't be a white man (he absolutely will be in the first Amazon outing), and
B. Bond ceases to be Bond if he isn't white.
There's no reason for modern Bond stories to require a white Bond. He does have to be a guy, but don't see why race changes the story.
why?
Unfortunately, women and people of color often don't have the same advantages and in some places are completely locked out. This makes it more difficult to change than someone like Leiter, Moneypenny or M who are much more flexible characters.
While it would still be possible to make a Bond without these attributes (they can still drink martinis, shoot bad guys and make quips) it would be a drastic change to the character.
I suppose the other perspective is that if Bond is primarily intended to be a personification of Britain, perhaps it's right that the character looks representative of Britain.