> A first step might be to expand the European University system to handle the influx of Graduate students that were previously headed to the US. Give funding, poach the frustrated non tenured profs from the US.

There is no European university system. There’s a French one, a German one etc. They all pay much, much worse than their US equivalent because they’re substantially poorer than the US. Remember, if Germany was a US state it would be poorer than every state but Mississippi. And this probably understates the difference. By average household consumption the US is $10,000 ahead of Switzerland, number 2 after Hong Kong. The money to massively increase research spending isn’t there.