https://www.youtube.com/watch?v=N4rkZI0sM1U

Because in a society where few men hold all the power and majority of men are powerless, most women would attempt to get it on with the top men. Now since most women cant get them, they will settle for these other men. Now since they will be with these other men, they will prefer if these other men werent as powerless so they will opt for a more equal society.

Women will curtail their own hypergamy in the end. Lets just speed it up.