We got better media coverage today, along with stronger governance, and the gridlock in the US system isn't just going to disappear overnight, so I'm not immediately worried they'll try and make a fourth reich as that would cause enough trouble at home.
I'm more worried for the safekeeping of human rights around the world, as Trump starts "making great deals" with Russia, China, North Korea. Most of those deals would probably include attacks on human rights, and most of the time the West would not stand for such concessions. Trump though, doesn't care that much about what happens elsewhere in the world, so he'll think they're selling themselves cheap and be happy about making "great deals".
Before you know it, half the world has pretty much been handed over to their elites to be slaves. That's my biggest concern with a Trump/republican presidency right now.