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The primary reason that the various peoples of subsaharan Africa have not been genocide and replaced by people from other regions up to this point is largely to due with the nature of the land and not that the people’s were evolved enough to be able to stop it. The land was to vast, disease, ridden, generally harsh, and unsuitable for stable agriculture for any peoples from other regions to consider conquering it and replacing the Africans. The other main reason is a lack of initiative from other races in doing so.

Compare this to south east Asia. Before it was inhabited by people of austronesian and East Asian ancestry, it was inhabited by the ancestors of the modern negritos, aboriginals, and Papuans. But they got killed and pushed out with the spread of agriculture and population descendant from agricultural people’s from the north. Mainly from rice farming iirc. Unlike Africa, the lands in south east Asia were much more amenable to agriculture, especially rice agriculture. It was less vast, and more accessible to neighboring more advanced and populous populations and civilizations that could spread into the region.

the population transition that happened in ancient south east Asia was significantly more doable than any theoretical potential equivalent into Africa.

I imagine that over the long duration of history, the next several thousand years, the peoples of Africa will gradually wither away as they are replaced by superior groups. Their genetics will persist due to admixture into other populations though, though I think that to will wither.