Eh I'm not opposed to a non-white Doctor at all, although I suppose that's true that you could apply my argument to that. Gender just seems so innate to me I guess that it puzzles me when fandom talks like the Doctor could just become a woman by switching forms, whereas it wouldn't be a big deal to me if he say changed his outward appearance to black and still otherwise remained the Doctor

even though that's been dictated by casting decisions that simply excluded females by default and not any actual story considerations

That's a fair point, although I'd argue that they could still have chosen to portray other Time Lord's as switching more readily between gender's as an option for Time Lord society, instead Romana for example was quite definite on being a "Time Lady", just as River always stuck with the female form

I do agree that it's frustrating that white and male is so often the default choice, but in this particular case it wouldn't entirely work for me as I suppose that I'm fixating on it being an ongoing storyline with an established male character, if they ever rebooted DW and started off a completely new version then I would be all for a female Doctor