As a postdoc, you can get a J and move. Constraint is finding a US embassy somewhere that is open for visa stamping. Plus you can't directly enter from many countries because of quarantine.
Forbes article is BS. These are legislative issues. Lot of fear mongering. As long as evil Reps don't take House we are safe.This will not happen. Period. Republicans are against bans on high-skilled visas. Lindsey Graham was very vocal on twitter against the H1B ban.
The modern republicans aren’t run by folks like Romney anymore. It is run r3dn3cks and populists who sees academia and university as the bastion to assault their backward thinking.