What incredible hubris to believe that some “experts” can predict the future.
A “bottleneck” event could cause 40% of humans to look like Inuits, 40% Namib Bushmen, and 20% everything else.
Even if the majority of the world becomes mixed race and “looks Brazilian” - people mate assortively for a host of traits and tend to judge “attractive” by what their own family looks like.
Tests with rats and lemon scented mothers and amusing and illustrative.
In grad school a guy I worked with and his girlfriend (gingers) looked so much like brother and sister that when they kissed it felt dirty.