As the public sector expands, it competes with men for the role of provider. Another factor is the Bubble in the University Machine —there are no consumer protection laws for college loans, and many loans are federally backed. Another factor is the natural synergy between feminism and academia —some men are smeared as rapists, but to PAY to be so smeared is definately taking things up a couple notches.
It is better to go to war than pay for that clap-trap.
Long ago, when there was a divorce, women lost big-time. But now, family law is robust, and by and large it favors women; men often must really fight for shared custody.
Often men now end up in a position of shouldering responsibilities of marriage, but none of the privileges.
This has gone on for some decades, and now before marrying, men weigh that risk very carefully.
Sorry to say it but the demographic winners here are cultures where women have little education or rights; Middle-East, Africa, and (to a lesser extent) Latin America.