Another factor is rents and house prices. If everyone you are competing with for that house can pay the mortgage on two incomes, you aren't going to afford it on one. So that's economic necessity I guess.
You can't logically conclude that based on that one data point.
Jokes aside, it was a data point to illustrate a change that I know takes place also in other countries; that women account for an ever larger fraction of people with higher education. The number of families where the mother makes more money than the man is slowly increasing.
I think if you dig into the data for US universities, you'll find that women are underrepresented in high-paying STEM majors and over-represented in low-paying majors like Dance or Early Childhood Development or Pre-1860 Russian Literature. Until that changes, I don't think your prediction is likely to come to pass.
That sounds like a value judgement. What difference does it make?