I don't think so. I mean, that is
a change that has occurred, but I think the more important change was women's liberation. Society used to enforce that women could not attain social status or sustain their own quality of life except via a husband. Now that women can have careers and operate independently in society, they have significantly reduced pressure to couple and consequently tend only to do so on their own terms.
This is good if you believe in egalitarianism, as I do, but it does have consequences. It would seem, though I'm not sure to what extent available data backs this up, that women will tend to couple only with a relatively small percentage of men, and without societal pressure to behave otherwise, are either willing to share them or simply not couple at all.
Unfortunately for them men who aren't in that category, their hormonal drive to mate is significantly stronger, and our culture still ostracizes and humiliates men who are unsuccessful with women. The upshot of which seems to be that there are an increasing number of sexually frustrated young men in society, and they are held in very low regard because of it, which one has to imagine is a very dangerous and destabilizing trend.