If whites, after hundreds of years of brutal expansion, despite still being the rulers of the world and having 24/7 access to all sorts of lust-for-child-making-boosters, dies out because of something as simple as messing up the reproduction part (you know, the #1 tip for surviving as a species) then we probably deserve to go extinct.
But seriously, whites won't disappear, that's just silly. We'll most likely be a minority but I fail to see an issue with that. It's just mother nature rebalancing the game.