It seems like that may be happening already. IIRC growth in the big cities has slowed right? If I still lived in DC I'd be either paying rent or struggling with a crazy mortgage.
I believe what is happening right now in the U.S. is internal migration of young people from cities with crazy real-estate prices, to cities with lower cost of living: Colorado (Denver area), Texas (Austin, Houston, Denver areas).
If you check the county level maps you'll see that even in the cheap cost of living states the rural counties are depopulating:
(Caveat: these are 2010-2014 trends, i.e. ~4 years old. Some of the trends have changed, although not significantly.)
Note that with the exception of ridiculously high cost of living super-city-centers, even relatively high cost of living city centers are registering population growth: the self-reinforcing cycle of jobs creating prosperity which is creating higher
population density which improves economic efficiency, which attracts more young people, etc.
A good example is California:
Note how even the Bay area and San Diego metropolitan area is registering growth, despite very high housing prices - while LA is already showing signs of slowdown.
The biggest loser of this process is the Rust Belt and Michigan in particular:
Ohio is struggling too, with the exception of the Columbus area that is seeing population growth:
Checking those maps will explain a lot about the rise of Trump politics and U.S. politics in particular:
- explains why Texas has turned purple in 2018 and could turn blue in 2020 and could be more and more blue from there on, like California is today,
- it also explains why Kentucky, rather unexpectedly, turned blue in a number of key areas.
- Democratic-leaning demographies are moving into urban counties, making rural areas redder and urban areas bluer. (Often these migratory patterns are not properly re-weighted through redistricting, which process was ~80% controlled by Republicans in the last ~20 years, making "natural looking" gerrymandering easier.)
These demographic trends, which are unstoppable like the tide, are also predicting a cataclysmic event in the near future (2020 or 2024), when Democrats will rise to power on all levels of the federal government and won't lose it for 10-20 years, until the Republican party gets rid of the racist aspects of its politics and remakes itself as a party not based in resisting change/progress.