I appreciate the effort but I have to disagree with your conclusions. As far as I understand it, white phenotypes are recessive and although it is possible for them to resurface the likelihood is much lower relative to instances of dominant variants. Even in a very favorable instance the likelihood of blue eyes (just as an example) is a coin toss. The likelihood of that trait being expressed decreases dramatically after that.
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Keep in mind that white fertility rates around the world have collapsed while Muslim and especially sub-Saharan African TFR remain strong.
Birthing age white females despise their own race and overwhelmingly support white abortion, mass Muslim and African immigration, and overtly anti-white movements like BLM. I can only conclude that white birth rates will continue to collapse even further while the non-white population explodes.
Best case scenario, small enclaves of whites are established and manage to maintain a tiny sliver of the white race on life support for a few generations. Even still, it's possible that a non-white majority simply wouldn't allow that situation after whites inevitably are stripped of their unearned privilege and social power.