This is an interesting piece at Brookings talking about marriage in America in terms of falling incomes. While marriage has fallen across all strata of the economic system it has been hit by far the hardest among those with lower incomes. The argument is that with fewer resources to provide for a family, many poor men are essentially unmarriageable, leading poor women to remain single, and have more children out of wedlock.
The implications of this would of course be taken by some to be a call for the growing necessity for social programs, but this isn't where I'm trying to go with this. My focus, rather, is to suggest that the so called "collapse of the family", or of family values, or traditional morals, or whatever you want to call it, is really just not happening. There may be some shift in our cultural assumptions about gender roles and the necessity of marriage, and this would easily account for the small decrease in marriage rates seen across the economic spectrum, but by and large people still today, and will always in the future, intend to carry on monogamous relationships.
It need not even be morally motivated, rather, it is in our genetic heritage to wish these things for ourselves. But in situations where we might find ourselves with no marriageable material around, we may have no choice. Would you rather your daughters marry a poor man who possibly has a criminal record? Or would you rather them remain single? Of course we would hope they would have other options, and I'm sure they will. However, the dilemma remains - is it really worth getting married if you are neither committed to the other person nor gaining any material stability from the relationship? To preempt a possible romantic objection about me including material stability as a qualification for marriage: you probably aren't going to be committed, or even attracted, to someone you see as unmotivated, unproductive, and untalented, regardless of material stability.
There is much to be said about the situations leading to such poverty and delinquency, and the solutions are also convoluted, but I think this is pretty strong evidence that what many people are interpreting as a collapse of family values is really just a collapse of worthwhile candidates for marriage.
EDITOR'S NOTE: I've added this graph from some Econ journal (I forget which) about marriage rates over time because I wanted to test the economic explanation on the Great Depression.
Some interesting trends there.