The genetic science backing up the "out of Africa" claim is very suspect. Its claim to authenticity is protected by the very esoteic nature of the mathematical modelling of the genetic forms which its inventors have created. (I've got a BS in mathematics, and can't even follow what they're talking about.) Also, three of the principle authors of this theory are admitted Marxists, which, in my book, makes anything they say suspect.
This isn't an argument about speciation--I'm a believer in the idea that we all have common ancestral types, though not necessary of the Darwinian sort. It's a matter of which peoples on earth are able to establish and maintain certain level of civilizations, who shares common (and exceedingly ancient) cultural icons, etc.
The African people are different from Asians and Caucasians; to claim otherwise is to live in a fantasy world. There are differences between Australian aborigines and Africans. And etc. There are FEWER differences, essentially, between Asians and Caucasians.
It's not PC to say so, but everyone knows it instinctively, and I believe archaeological research is proving it out.
This isn't to claim anyone is "better" than anyone else, so let's avoid indignant posturing. We're just different. The differences are displayed every day.
Sub-Saharian Africans, I call them 'stay-at-home' Africans. Everyone else in the world are more closely related to each other than they are to the Sub-Saharian Africans.
Well it is plain to me that the reaces of mankind are one specie offshooting from a common ancestor. Where we went wrong in our the0rizing was the timeline. It is becomming clearer of recent that Homo sapiens has been around a lot longer than we once thought. By a factor of say .... 10 or so. Thus time is found for the wide diversification of the races we see today.
I believe as well it is no accident that the Story of Noah allows for one common ancestor. Just as it is no accident that the ancient Hebrew texts speak of the circles of heaven in the same epoch that Hindus believed the earth was balanced on the backs of four celestial elephants and thousands of years before the great thinkers of the West were sure the earth was flat.