Which is a silly argument - mine or theirs?
Sorry. I was referring to the author’s claim that demand for large homes dropped because people have smaller families.
A little common sense will show that people with no kids have more disposable income that they can apply to a larger home if they wish. IOW, DINKs can afford a larger home than people with kids.
Personally, I think a couple living in a 10,000 SF six bedroom home is a little strange, but I can guarantee you there are a great many of them.