Hahaha yeah its a sad story. One day we will all be mutts . I cant wait. We're in a couple thousand year transitional period. Culture meshing is still the toughest thing for people . (Racism, prejudice )
Luckily their is that silver lining of a one mutt race of humans. Perfected through diversity
Well I don't mean to contradict. But I don't actually think that will happen. Even if genetic mixing kind of makes everybody look the same (I don't think that will happen either, because species tend to benefit from lots of genetic diversity. It's a strength that there are different kinds of people, different so-called 'races') Now in the future, there may be racial groupings that arise due to things like geography, politics, etc. In other words, people may still superficially look different around the world, although a visitor to this future may not recognize these new 'races' as any thing resembling the 'races' we have today.
Example: Africa, the cradle of the human species, has the greatest genetic diversity of any continent. For example, West Africans, South African bushmen, Ethiopians, and Nigerians and Lybians are possibly more genetically distinct from each other than Irish people are from Italians, or Northern Chinese from Southern Chinese, or Mongolians from Russians. Look at pictures of people from, say Burkina Faso in West Africa compared with the pictures of the Rwandan women
@Kavasseur posted. Are those people the same 'race' because they happen to have been born on the same Continent? I would say not. And that is a good thing. Diversity is strength, not weakness.
But exactly like you said, what happens with people's skin tones is really literally superficial.
Culture is hard to change. Cultures clash.
New cultures are always popping up (and old ones dying), cultures are merging in friendly and unfriendly ways. Some of the new cultures are virulent and destructive. Even if everyone on the planet had identical genetic material, there would still be wars based on culture, nationalism, fighting for scarce resources.
So, yeah, it is a sad story, unfortunately without an easy answer, I'm afraid.