As much as I see your point, that is unrealistic for many, many people. Especially in the US where that is not prominent societal norm.
My parents live thousands of miles away from any of their children. Most of my siblings don't have the money to save properly for their own retirement let alone support their parents. And housing situations often do not support two households living under one roof.
And this applies to families that still talk to each other.
This is an underrated point, but I hope you can see how prevailing factors in both the business world (Amazon's two-day shipping springs to mind) and the culture are seriously stacked against these mores.
Caveat emptor: quick googling didn’t come up with evidence one way or the other.