For now there's still hope that the Trump admin is too stupid to succeed and this chaos is their high water mark that will roll back. But I'm certainly not the only scientist that has been keeping notes about what European employers sponsor visas for biotech and so on. The hard part would be that the 'nice' places to live in the EU are the same as the US with rising housing costs, varying sentiments about immigrants, and that while pledges like this 600M are great, they're not really a large amount of money compared to what various American universities have had to spend. Existing spending frameworks won't peter out for another year, at which time we'll see how things land for the rest of the scientific community.