How about this, then? After genociding them and systematically (using the word correctly) killing white people for a generation, destroying their nation, their peoples, their identity, their lands, and their very lives, it was only about 20 years, one generation, until Zimbabwe et al were literally begging white people to come back and fix their mess. So "in the long run" isn't going to be several lifetimes, it was certainly longer than the lifetimes of all those farmers they killed because they were white, but for the ones who fled successfully, it was only a quarter of a lifetime before the pendulum started to move back.