I’ve seen studies on this. The abstract from here refers to some.
The articles I’ve read suggest that men are more likely to marry more educated and successful women today because there are more of them and they tend to be in the workplace unlike previous years. Consider a doctor. Before the pool of women were probably nurses, now this includes other doctors too. In How to Succeed in Business without Really Trying the love interests were secretaries - there were no other single women. Today this seems odd.