This is closer in some ways to historically the way things have always worked. The men of status had multiple partners while the majority of men remained single and childless. We know this both from historical record and DNA analysis.

What's new is women can do this without settling down or having children, casually IOW.

Monogamy is better for raising children and for societal stability, but monogamy seems alive and well, just most women have to lower their standards and settle for a regular guy as time runs out on their biological clock and their desirability drops with age. That's making a lot of sweeping generalizations bordering on the offensive, but seems necessary to talk about society in general. Obviously individual motivations and paths in life vary widely.

I wonder what the societal implications are for having a majority of young men be very undesirable and a majority of women start on top of the world at 18 and steadily fall down from there and have to settle. It doesn't seem to be good for either gender.