I won’t disagree with the caution about “just” moving, but I will say that it can be accomplished, because I did. The morning after the election in November 2016, my wife and I agreed that we would leave the US. We were already thinking about it for many reasons, but the election was the final, very emphatic nail. Several months of extremely difficult work followed. In July 2017, we put our lives into shipping containers for the cross-Atlantic handlers, and in August, we got on a plane ourselves.
It is not easy. It is not trivial. It takes many, many months of deliberate, concerted effort, week after week, solving many problems and jumping through many hoops. It also, I readily concede, demands many personal prerequisites: money, chiefly — we drained thousands out of our accounts making this happen — but also a transferrable career. (I work in tech, which is essentially borderless. Compare a friend of mine who was investigating a move at the same time; he’s a lawyer, which is one of the least transferrable fields imaginable. He could have done the necessary work, but he chose not to.) At the same time, though, we had our own obstacles which would be irrelevant for others: we have kids, so we also needed to transfer schooling, and more importantly my wife was born in Iran and naturalized as an American citizen, leading to a much higher bar for security screening to get approval to immigrate.
But it can be done. I am proof. And we have no meaningful regrets; this is a net positive by a wide, wide margin, and for anyone who has the means and opportunity, we recommend it.
As far as how we’ll be affected if Trump wins in November, we expect three impacts: (a) We were planning a trip to visit the States next summer; this will probably be canceled. (b) We’ve begun the process of becoming naturalized citizens in our new home, but we’re dragging our heels a bit; we will buckle down and get it done. (c) We expect lots of Europeans to confront us, asking, how is this possible, what are your compatriots thinking, why did America do this insane thing, can’t your people see how dangerous and destructive he is. We already get this, but we’ll get a lot more in the wake of a re-election.