I think Europe will eventually rise up simply because the people from here are from here. We are made for this climate, incl. light skin and blue eyes. It is unnatural for Africans and other tanned people to live here. You can force it through eugenics and mass immigration but I think things go back to normal eventually. It happens everywhere. Mother Nature will not allow it forever.
It's a nice sentiment, but look across the world it's clearly not the case. The natural inhabitants of Australia, compared to the pasty Brits & Irish descendants that governed the place for 200 years (probably just stop around that point tbf). Same with European descendants in southern states of America, the Spanish descended ruling class of South America etc etc.
I suppose if civilisation does, to some extent crash, that may occur. If there's regular mass power outtages that last for months, food is scarce, people literally form pre industrial communities deep in the forests etc, but we're getting so far from our daily realities, it's hard to really fathom how that would go down. Hardcore militaristic lockdown, i'd imagine.