Don't forget all the researchers and academics who will depart for countries because of this. There is going to be a brain drain the likes of which no one has ever seen.
The loss of institutional knowledge is one of the scariest things about this.
I do think Congress will flip in 2 years after Trump and company wreck the economy (though we'll see how much Congress truly matters then). The thing is, even if we get a Dem sweep, all the knowledge lost won't magically come back. It's gone forever.