The world is not my oyster
I'm deeply in student debt. I went to school in the UK, so as a foreigner, I paid twice as much as a UK citizen. But I still have a pretty good credit score back in the US.
However, when I sign in to my online account, it references my credit, "The world is your oyster." Which, sure, maybe I can get value in return for a good score in the US, but this will not happen anywhere in the world. The world is not in fact, my oyster.
If you've moved away from your home country, your credit starts over completely. You can't just easily get a job in the field you're an expert in simply because that new country won't hire you because it has its own citizens to hire first. And when you are lucky enough to get a job, it's not going to be at the same (or equivalent) salary level that you might be used to.
This happens for all immigrants to any new country. So next time you see someone that knows more languages than you do, has moved to your country and is taking whatever job they can just to get by, cut them some slack. Show them some respect. They're more adventurous and courageous than you'll probably ever be.
But more to the point, we're becoming an increasingly global world. People are moving to new countries all the time, or simply working remotely while traveling. I don't know how it will happen or when, but we really need to get over our nationalism and xenophobia and open up borders all around the world. If there are fewer barriers, there will be less mystery around foreign lands, and less demand to move to just one place. Remove the difficulty around simply getting into a country, and you remove the volume of demand to move there. Remove people from war-stricken countries, and the dictators don't have anything to lord over. All law-abiding humans should have the ability to live wherever they want. A true global melting pot would create a more peaceful world.
And maybe...maybe if people could go to schools all over the world for the same rate, we'd see a flattening of access to education and an increase in competition between academic institutions.