Example: https://www.brennancenter.org/our-work/analysis-opinion/how-...
In case of the cities you don't even need to move that far. I know multiple people in Seattle who just moved to nearby towns 105-15 minutes by car, 20-45 by transit) to avoid Seattle specific issues, and some people who move just outside of king county to avoid even more nonsense. Mostly techies, but not exclusively.
It's not like American cities haven't been hollowed out before, NYC included.