I think you're on to something. It certainly applies to my wife and most of our friends as we think about starting a family in our early thirties.
As a generation (myself included) we got married in our mid-late twenties instead of late teens early twenties. I don't hear about near as much cheating as what seemed to go on in the seventies with my father's friends. I would guess that we will see the rate of infidelity and divorce drop significantly.
That was Hugh Hefner's influence -- his magazine really took off at the end of the 60's and stayed big......he was married to Barbie Benton, but not so's you'd notice, not with a mansion full of Playmates, and not for long. But Hef wasn't a Boomer. He was Silent Generation, launched his magazine in the early 50's. Between them, he and Betty Friedan damn near killed off marriage. Friedan was same generation as Hef and Gloria Steinem (who's about 64 now).......Friedan chose her boyfriend over staying in college, moved to another city to follow him -- then he dropped her. Made her bitter. She's the Angry Old Woman of feminism, real piece of work. Steinem was Queen of the One-Liners ("A woman needs a man like a fish needs a bicycle"), finally got married at age 61! Has actually smiled 6-1/2 times since she turned 20.