Lots of people are moving to big cities, immigration means that the population is still growing very slowly.
Even if all these small counties emptied out, I don't think many people would want to live in them, you can already snap up housing there at a bargain price.
My assumption is that instead of moving to the biggest cities in the us, people are spreading out amongst the smaller cities, not the myriad of tiny counties in the US.
Am I wrong?
EDIT:
https://web.archive.org/web/20220324065328/https://www.nytim...
"But the 10 fastest growing counties last year accounted for nearly 80 percent of the national total, a testament not so much to the rapid pace of change in these places, but to the lack of significant growth in the rest of the nation."
Also, considering I created city-data.com with information about U.S. cities and counties, I know ;)
It's only a bargain when you're looking at it from the perspective of someone making stupid money doing tech or high finance in a big city.
What I'd like to see but can't find in ten minutes of googling is a combination of these charts
https://www.nar.realtor/research-and-statistics/housing-stat...
https://www.census.gov/library/visualizations/interactive/20...
So that I could see a median income / housing cost ratio by county.
I still think the main reason that people aren't moving into these small counties with cheap housing though is that nobody wants to live there.
By many metrics they're not pleasant places to live.