I mean, you are going to see an exodus of tech workers regardless as US economy withers up and other countries (probably in EU) pick up the slack.
China won't even have to have high salaries, all they would need to do is basically set up immigrant neighborhoods that have all the familiar things that US people like, and through the nature of just being around people of similar status, whatever the salary everyone gets paid gets normalized - there isn't anything you would be able to buy to "flex" on your peers, and everyone would be in the same boat.