"The decline could have far-reaching implications for U.S. economic and social policy."
Is this an emergency? Like global warming, it's simultaneously slow and fast. It's so slow, you may think it's not real — alarmism — or not a problem — we'll adjust. But it's fast too, because if we're going to attempt to control the trend, we need to get cracking.
If it is an emergency, what could be done? Is there a role for government? What if government wanted to get involved, really deeply involved? Suggestions? Don't violate any rights. This is a government of laws, in which women have reproductive freedom. But there is the taxing power and the spending power and so forth.
In the style of the environmentalists — who would have us radically reorder life to stave off the perceived calamity — devise some policy. I encourage comic/dystopian brainstorming here, but please keep the foundation of reproductive freedom and other basic American liberties. I'm not asking for "The Handmaid's Tale." That's been done.