Consider that Trump actually can't do much. The Executive branch has the most visible power is at border crossings, particularly at airports. It's the fundamental power of group leadership (ownership?): "Who's in, and who's out." Trump is intoxicated on the prospect of wielding that power.
"How things might go". Hmm. There are three ways things could go rotten. Some all or none could happen: a) Muslim registration, internment, expulsion, b) "Trump resistance" is redefined as "treason" and the NSA and FBI given full reign to detect, disrupt, and prosecute individuals based on digital evidence (or no evidence), c) new war, or multiple wars, started purely because it's one of Trump's biggest powers as Commander-in-Chief (although it shouldn't be, since Congress is supposed to be the only part of government that can declare war).
What disgusts (and frankly, surprises) me is the number of Americans who would shrug (or cheer) at all of these outcomes.
Sorry, I was going to argue that you're better off staying, and fighting, but anyone of good conscience has got to start thinking of themselves as Jews in Germany in 1936. Your conscience won't let you shut up, and your talk will get you in trouble. New Zealand is nice.
I don't think it's that bad yet, and it may well not end up that way. I think David Frum's article was pretty good in terms of how things might go badly:
