Yeah. I said that rather badly. Thanks for the call-out.
What I meant was that if substantially nobody wants more than two, then substantially nobody can have less than two or else population shrinkage (or collapse) will inevitably occur.
IOW, the absence of willingness to have large families will remove the option to have no family. Assuming a constant population is to be maintained.
Now your cite indicates the actual trend here in the USA is rather the opposite. Having more than 2 kids is a/the popular option with many many people. Which in turn affords the opportunity for one- or zero-child families to other people.
In one way that’s the best of both worlds. A variety of options are available to everyone. And as long as the rough balance comes out to 2-ish we can sustain that variety indefinitely.
OTOH, that can turn into another form of polarization. Folks who favor large families may be doing it for religious or social reasons that quickly translate into political reasons. Which might ensure there are enough future people, but not a good mix of future people.