This remains to be seen. Most of these communities have either no jobs or one primary employer are are very subject to disruption. When you're laid off and your house becomes worthless because the biggest employer in town is shutting down, what are you left with?

It also limits your mobility dramatically. By working in a HCOL city, even if I'm struggling to save, I'm maxing out my 401(k) plus match and more every year. If I want, I can do that for a while and then move to somewhere cheaper. My family in the midwest, despite saving enough for an incredibly comfortable retirement there, couldn't purchase a home anywhere within 1.5 hours of Seattle if they wanted to move there now.