Since I was tagged in this thread I guess I will give my viewpoint on this subject, since the Out of Africa is my favorite subject. Also I am hoping I do not sound like a "black supremacist". If I do I apologize.
Anyhow. It depends on what you mean by "black", remember "black" is just a social construct just like "white". Even though I consider myself black, I know that black(or white) are not biologically defined in science. Terms such as black and white are mostly based on phenotype. But were the early homo-Sapiens in Africa "black"? Based on phenotype they were, due to their dark skin being needed for the harsh UV rays and cancer(as noted by recent studies). Even humans prior to homo-sapiens such as the Homo Heidelbergenis had dark skin. This is like millions of years ago. Meanwhile pale skin in homo-sapiens is much more recent(about 6000k according to scientist), this was due to higher latitudes, vitamin D and a mutation that occurred for the pale skin gene.
BUT a better question in my opinion would be, "is everyone technically African?" Because it is much more tangible and yes their is a such thing as being genetically African. Yes everyone on this earth is technically "African". As Africans today on the continent carry the oldest genetic lineages in humanity. Yes that is indeed true. But one specific linage that Africans still carry is mtDNA L3, which in fact is the ANCESTOR of all Eurasians(those outside of Africa):
mtDNA's N and M(as you can see on the map) come from L3(which originated in East Africa). N and M are the ancestors of ALL Eurasians. And its interesting, because Eurasians only descend from a small group of East Africans and not all Africans. Just those East Africans that migrated out of Africa. This diagram shows that those Eurasians
are a subset of those migrating East Africans.
And in this genetic tree it shows African ethnic groups such as the San people, Pygmies, Bantu's and Nigerians as being the root of the family genetic tree.
Why? Because those Africans and indigenous Africans carry some of the oldest lineages. Especially the San people. In my opinion the first homo sapiens, at lest the ones that were apart of the out of Africa were "black" via phenotypes. So is everyone technically black? Well in my non-science personal opinion...Our ancestors were "black" and that's all I can say. Again this is just my personal opinion and not based on science.
But no modern day non-blacks are NOT "black", because their phenotype is not. They now have their own variations and own genetic lineages that are now unique to those found in Africa today.