I don’t think this is realistic at all.

It basically means a huge percentage of these people might never come back. Once you go back to your home country, life moves on. Your plans change. Your path changes. And that could be terrible for the economy.

Hundreds of thousands of people either wouldn’t enter the local economy, or they’d be delayed for a very long time. I really don’t see companies being okay with that. Think about all the students who are ready to enter the job market. Instead, they’d have to go back home, wait for a visa, and only then come back. That kills the speed of the economy and makes hiring way more unpredictable.Or at the very least, it would seriously slow things down.