This isn't remotely true. The overwhelming bulk of people living outside of major cities simply live outside of major cities. In the United States some 4 million people own or work on farms. 60 million people live in rural locations. I highly doubt the other 56 million are in forestry and mining.
Some people live in rural places for no particular reason than that's where they like to live. I live in a rural location, and I certainly don't gnash and gnaw about how everyone is going to starve unless I have a black-soot belching F350. I can actually imagine a world where I can live sustainably as well.