There's one more point that's extremely important, and is often overlooked.
People tend to follow the examples around them.
In the past young women were not discouraged from marrying - and - were expected to marry, not to senselessly delay, or turn down good offers.
The result of that is that young women were competing for potential husbands. This encouraged men to try to act as good husband material. These tendencies reinforced each other, and reinforced marriage.
Now the young man looking for marriage is mocked by young women, young women who will laugh and say they aren't ready.
And what is the example that most young women are giving to their peers today? It is not good, not good at all.
Today, young women compete for those not interested in representing themselves as potential husbands and fathers, but rather for those who deliberately cultivate the image of the "bad boy" - to put it in crass terms.