I think if you ask most women, they’ll disagree with this hypothesis. I doubt very many women aspire to be single parents. Fewer still aspire to polygyny with one high status man.
With regards to poly whatever, it’s frequently mentioned that the top 80% of women are competing for the top 20% of men on dating apps. What happens as cohorts age will be the interesting part.
If I had to wildly speculate, a whole lot of folks are going to end up unhappy, and those who can will settle for whatever partner they can find once they meet the point of emotional exhaustion (ie loneliness, etc).
Well from my experience it isn't settling for an older man.
When I was in my 30's and making $100K+ I tried on-line dating and was pleased at how many desirable women responded to my profile. Assuming that would always be the case, I decided to focus on my career and postpone getting into a serious relationship.
At 47 I decided to "settle down" and resume on-line dating. With a target age range of 34 to 40 since I would like to have children. I am millionaire, tall, good looking, muscular, high-income, etc. But the only responses I received are from women 50+. Not sure how this ends for me but at the moment I feel a sense dread.
Just my two cents, I’m a bit younger than you but similar means, married but in an open relationship and date. Be picky, but cast a wide net.
I don't have hard statistics and won't try to look them up.