Maybe now that the early phases of globalisation have settled down and all the frontiers have dried up, the global culture of movement has died down. It's a lot harder to think of moving as a possibility, let alone a good possibility, when it isn't part of the zeitgeist. People used to do it a lot in the 1800s especially, and it was something you could get swept along in - and there was an excitement of going to a fresh place where most people were new as well, economic opportunities and social relations were still up in the air.

Now you can trade a grind in one settled area for a slightly more profitable grind in another. With the tradeoff of losing contact with your whole social milieu and having to start a lot of things from scratch in the new place, while you're surrounded by people who have a lot more than you because they've been grinding in that place for years.

Not appealing, so it's no surprise that it's mainly the highly-educated who can a) seek high value economic opportunities and b) are guaranteed a welcoming social reception from university or work colleagues :)

People like us should be more generous about the incentives governing the lives of the new post-mobility local cultures.