Can you imagine what would happen if a large company like Coinbase or Overstock would make the same decision now? Donald Trump is saying he wants to protect local jobs and create new job opportunities, but he smack tweets Bitcoin and in doing this, chase away legitimate companies that wants to operate legally in the US
Don't take the words of Trump and his likes at their face value
Today they can say one thing and tomorrow they say the exact opposite like they have always said (and thought) so. These people don't give a slightest fuck about Bitcoin (and most other things, for that matter) as they are only interested in gaining more power (and not losing it in the process). In case of Trump specifically, he is going to run for POTUS next year, so anything he says (and more importantly, what he does) should be considered from this angle
Regarding the questions raised in the OP, cryptocurrency operations are not bound to any specific area (apart from their client base), so if it means moving out of the US jurisdiction, they will do that without any second thought. Technically, the American government is shooting themselves in the foot with such acts, but more power to them if they choose so. Really, who are we to stop them and why? Let them dig their own grave