Let's swap the vaccine example with something more showy. You seem to be saying that Crocs users have a serious chance to die out in one or two thousand years

Let's swap the vaccine example with something more showy. You seem to be saying that Crocs users have a serious chance to die out in one or two thousand years (after all 30 or 60 generations are peanuts). I'm sure the effect is real. I'm not holding my breath though, because seemingly humans posses another mechanism which can mysteriously mask the trait of i-like-ugly-shoes within just one or two generations. (And with almost no one dying out?) Just like it didn't take 30-60 generations for the trait of i-hate-suspicious-injections to die out. I avoided the word "evolution" in hope of achieving understanding at least about the territory if not about the map.