This trend is certainly one aspect of the explanation for the decline in the number of long-term relationships.
In 1974, the Equal Credit Opportunity Act (ECOA) made it illegal for banks to discriminate in lending based on sex or marital status, allowing women to get credit cards, loans, etc.
In 1978, the US passed the Pregnancy Discrimination Act.
The rate of working women went from 30% in the post WWII 40s, to over 50% in the 1970s.
And divorces. They went from 9.2% in 1960, to 22.9% in 1980, and have been slowly declining since then.
I think the political split between genders is MUCH stronger for singles. It's kind of a trap actually.