A more likely springboard toward the change you describe was probably the growth of the suburbs and automobile culture; it has allowed people to see more of the world, to be mobile and somewhat empowered which leads to: new horizons, the grass is greener, etc.
Add to it the influx of women into the workplace starting with WWII and the dawn of the computer era and there's your catalyst for societal upheaval.
Today half the kids born in America are born out of wedlock, most marriages fail, religion is on the wane: I don't know where we'll wind up, but as always life evolves.