I think, because I as a Whovian have adapted to just having a white Doctor, I cannot imagine there ever being a black one. Nonetheless, it would be good to see a change-as Clyde sort of pointed out in 'Death of the Doctor'. :)
Good question, by the way. :)

thats an idea that clyde is the first black doctor.

I dont care if hes black or white. It dosnt make a difference to me- im against racism in any form,

Actually, Danny Anthony (Clyde Langer) would be a great Doctor, at some point. Perhaps Richard Hamond, too-he resembles David Tennant in some respects. :)

I think we can try...being african american in the USA..and i watch Doctor Who on a regular basis..a black Doctor..or even a female Doctor of color would be good to see.

^ I agree! There is nothing wrong with having a black Doctor or a female Doctor, for that matter. :)

I'd like to see a Ginger Doctor thou...

^Same! The next doctor should be Rupert Grint! LOL!

No black doctors. Just no. It contradicts all of history. There has never been a black doctor, so there shouldn't be. Not racist here, but traditions should stay traditions.

But yes, ginger would be great!