i don't think that's what happened. i believe women wanting economic independence (rightly so) and thus pushing into work was a bigger factor.
If well managed I think this is possible. But it's not given. Another scenario is houses in the countryside, small towns and far suburbs getting empty and soon uninhabitable due to lack of maintenance/infrastructure degradation, and remaining people packing close to core areas that remain high cost.
The small towns in my area are desirable not just because they're small, but because they're small and have the same amenities as a bigger town. These towns are also increasingly relying on debt to fund decades of deferred maintenance just to keep the amenities they already have alive.
This would become dire if (for example) property values fell, as residential real estate taxes make up the majority of tax revenue. This might happen if demand for the town fell (perhaps due to fewer people), which would quickly become a catastrophic cycle (revenues fall, roads and schools deteriorate, which makes the town less desirable, repeat ad infinitum).
In a future with few or no kids, schools won't be needed.
So you lose some economy of scale when enrollment drops, you have to cut school funding, which makes the schools worse, which makes the town less desirable, which drops real estate prices, etc.
This was my first intuition.
> In 1957 it was 96/100k teen women had babies, 62/100k in 1991 and now down to the current rate of 11/100k
That's per 1k, not 100k [1]. 96/100k would be an insignificant amount. 96/1000 of girls and women ages 15-19 means that any given year, 10% had a baby, which is a substantial contribution to overall birth rates.
1. Teen Births in the United States: Overview and Recent Trends, https://www.congress.gov/crs-product/R45184
A lot of the decrease is also correlated with access to birth control which drastically reduced accidental pregnancies which were a decent amount of the fertility rate. Then we attacked teenage pregnancy with a vengeance. In 1957 it was 96/100k teen women had babies, 62/100k in 1991 and now down to the current rate of 11/100k. The postponement of births expands the time between generations which compounds the problem. An 18 yr old could have a baby that has a baby at 18 before a 36+ year old mom has their first child.
All this leads to exponential decay of humanity. In the near term we don't have to worry about extinction but we do have to worry about the pyramid schemes we have to support non-workers (like social security). This will all play out much sooner in Asia where the TFRs can be half of the US/EU. Imagine due to China's one child policy a young working person will soon have to support 2 parents and 4 grandparents somehow. There will be some kind of reckoning and some of the speculation around what it will look like is quite grim.