It was meant ironically but not the part of the US’s benefit from the brain drain. There’s a lot of hysteresis in the system but the current draconian rules will probably drive a lot of research elsewhere, especially when you can live in a wealthy country and not have to put up with the hassles of living in the US.

My guess for the big beneficiaries are Canada (right next to the US, with both Vancouver and Toronto benefiting) and Germany, despite the lack of English.