Most of those people either a) commute a long distance to scrape by and lose a significant chunk of their earnings on gas because they own a 30 year old hoopty of a truck or b) live off of welfare. That’s how a lot of these small communities continue to exist. People can’t afford to move out and obviously don’t want to commit suicide (nor should they).
Having come from a small town, I don’t think these people will move even if it’s paid for. Many rural folk have these warped views of more populace towns and cities because of the warped political rhetoric and constant bombardment of negative news coverage.
It’s an extremely difficult problem that I don’t personally believe has a solution because you have to have willing participation (some will, but most won’t).