The name of that "natural change" is "death". Not many children, and the children there are will be raised without fathers. Plenty of evidence that fatherless kids end up with all sorts of issues not conducive to civilized behavior.
You want to see the ultimate result of that "natural change"? Look at New Orleans when the lights went out.
Transitions are always bumpy. The new social arrangements will sort themselves out, as long as government socialist engineers stop meddling. For the past 30 years or so, our government policy has been "No father? Okay we'll start sending you monthly checks, food stamps, and housing vouchers." The policy needs to be "No father? Well you'll just to have to find some other way to support yourself and your children." The government meddling is interfering with the natural processes of social change, and getting predictably lousy results.