This is exactly what the US wants though. As Europe becomes more destabilized and uninhabitable, more and more people (especially skilled workers and highly educated professionals) will be looking for a way out.

Some will probably go to places like China, but the vast majority of them will end up in the US as cheap labor with H-1B visas, competing and dragging down domestic wages. Literally cheap labor from Europe.

The irony is that this was exactly what the EU did to the post-Soviet states in the 1990s. A lot of brain drain from post-Soviet Russia and Europe practically received a whole bunch of cheap skilled workers taught by a very high quality Soviet education system. This is shock therapy in action.

This is what Western imperialism has been doing to the Global South over the past century, with economic migrants moving to Western countries.

Only this time it is happening to the Europeans themselves.