"Travel" or "movement"?
I am the first generation to be born in the country I live in. When my (grand)parents left, they left under the assumption that there would be no, or maybe very little, chance of going back to the Old Country. They took a boat over the course of many weeks to traverse an ocean; an era before cheap air travel.
When people move in the future, to hopefully have a better life than where they current are, it may be that they may not be able to go back (as easily) to where they came from.
The fact that we can now travel back and forth cheaply over great distances could simply be a temporary blip in human history, and we should perhaps consider this era could be ending. You can still move, but it will be more 'permanent' going forward, and travel is will be less frequent/easy/cheap/etc.
Under the current regime of 'cheap' travel in which the externalities of climate change are probably not taken into account.
Living in a poor, rural county with poor schools and few jobs can really mess things up.
Someone I know is getting divorced.
She was a very high earner who moved to a low-cost of living, low wage area to be with her husbands family.
She had previously earned very high wages, but took a significant pay cut to live with in-laws.
As the divorce is concluding, she realizing that the terms of the divorce prohibit her from taking the kids out of state.
Which means until her kids are 18, she’s effectively trapped in a market where her MS in Engineering gets her a job at Walmart.
She had previously worked for a major firm in New York, and then worked for a the local government until she had to resign.
So she’s basically screwed.
Plenty of people have skills and credentials that can only be used with relocation. A MA in Journalism isn’t very helpful outside big cities.