The article's point is that historically, large-scale change is driven by groups rather than individuals. And the groups are not cabals of HYP grads, their compositions are wide and varied. So it's worth revisiting exactly what your comment assumes: that there is a strict hierarchy of individual capacity to drive change, and we need to segregate people according to said hierarchy in order to push society forward.
> Also what is wrong with giving people the choice to go to Yale?
99.999% of people don't have the choice to go to Yale. That would be true even if everyone in America were given "equal opportunity" from birth -- it's how scarcity works. The article answers this question for you in case you want to give it a second read.