I think that depends on a lot of factors. E.g. will there be a turn around in the US, and if so how fast? Will Europe and other nations increase science funding to account for all the new talent that wants to come? Will that funding be permanent, not just a one time effort?

Also, if the US restores their democracy and also decides to value science again, will the salaries for scientists abroad compete enough to prevent scientists moving back.

To maintain a sustainable lead the money and investment has to be substantial and long term.

No, the US still spends 5x what Europe does on biomedical research, measured as a percent of GDP.

China is putting up the money, not Europe. Europe only gets a slice if they invest in it.

lol no it's Europe dude for the same reason they are lagging in everything they will lag in this why would you think otherwise.

On a more serious note any of the freedoms people are talking about disappearing in the USA were either already long gone or a decade further down the road of dying in Europe. Hell they are routinely jailing people for speech now.

For all the recent hand-wringing about the U.S. becoming less welcoming to immigrants, the U.S. is still far, far ahead of any European country in terms of immigration opportunities. If you're qualified to come to anywhere in Europe, you were qualified to come to the United States years or decades ago.

No. Europe is in decline. Asia will.