I doubt it.
It may be true that fewer people are marrying and having children, but that doesn’t mean that the nuclear family is dead or dying.
Another Freeper here with strong families all around. Wife’s family, my family, my adult kids, all married - no divorces. Have to go to relatively remote in-laws to get to first divorce. Middle-class folks who others would deem very successful - strong families are an asset (and divorces are costly, as others here have rightly pointed out).