Those w/families will have a tougher time. In the end, self-preservation. If you don’t have the money for any kind of decent quality of life, you will do what you have to do. Maybe the kids will move, too. It certainly won’t be any easier for them.
I know back in the day when my parents decided to move back to Italy it was a major shift in life. Us kids had to learn the language. We were okay w/it. In a few years when we had to move back, I didn’t want to. Kids adjust to just about anything. Looking back, I feel lucky to have had that experience.
Those w/little kids will have to think about what’s best for them. That may or may not be dealing w/the high COL and the future it holds for their kids.