I grew up in a Sears & Roebuck home, as were a good portion of those on my block. The Wikipedia article on the subject says that there were 70,000 of them built[1]. So I see this as more of something that has come and gone, probably a few times, and we are back on the up-swing.

The Sears & Roebuck were partially assembled (think wall by wall), and then those parts were hoisted off the freight trains and nailed together. There was still a lot of work that needed to be done (often by professionals), but it really cut down on the (especially local) costs.

[1] https://en.wikipedia.org/wiki/Sears_Catalog_Home