I disagree. I think that the good people should all make an effort to leave, because the sooner it crumbles, the sooner it can be rebuilt.
There's no un-ratcheting the loss of freedoms there. It no longer has basic liberties or the rule of law, and it's actively dangerous to anyone trying to bring about changes to that status.
The US may be far from perfect, but it's important as a country founded upon the right ideas. If it crumbles, we all lose, regardless of where we live.