Yeah, I mean, imagine a President putting his enemies in heavily guarded, secretive camps where people die? Totally nutso, right?
Anyway, like I wrote, I don't know what's going to happen next year and no one else does either, so questions like these are really just a way to gauge our fears. There's a pretty solid chance that Trump loses next year and goes away and lets us all pretend that the system works for a while longer; but I think it's absolutely foolish to believe that there isn't also a good chance that following a narrow—or even slightly larger—loss, he just says "fake news!" and then obstructs, bullies, and grinds down an opposition that will refuse to believe that the worst has finally happened and a sycophantic media that will either hail his greatness, blame "both sides," or gravely and chin-strokingly deplore him. The street protests will either be ineffective or treated as criminal disturbances and either way, he and his supporters will stake his legitimacy on the necessity of belittling or supressing them. Think 2000 on a much grander scale.
Because if we've learned nothing else over the last four years, we will have learned that when the most powerful man on Earth wants something, he can usually just take it because it's usually easier to let him have it than to confront him over it.
(This is the dynamic of an abusive relationship, one of which we are all in at this moment.)
(And besides, putting dissidents in FEMA camps is passé when you can rely on stochastic terrorism to keep them quiet enough and largely ineffective.)