Trump assumes power in January, and by the time we get to Inauguration Day, we find that he has oddly stopped talking about "The Wall" and "Muslim Bans" and he is instead focused on "Border Security" and "Safe Zones for Refugees" (safely located in their own countries or regions, naturally). Trump works closely with the Republicans to gut our national safety net and build a non-progressive tax system that waits for financial relief to "trickle down" to unprotected workers who have lost the right to unionize or earn a fair, living wage. In other words, he behaves as any normal Republican would have in office - he's Mitt Romney, only richer and more orange.
2.
The other likely (tho slightly less so, methinks) outcome of Trump's assumption of power in January is that he actually tries to do what he has said he would do. The uncertain part here would be the order of things. If Trump starts, as he seems to have hinted, with a Public Works program (Massive Infrastructure Investment), he would likely get cooperation from the Democrats. That would be wise, as I'm not sure whether Democrats would go along with any proposed measures of Trump's after he starts down any racist or xenophobic policy paths. Mass protests would follow. It's difficult to say how long these first several evenings of protests will progress. They are important, and need to be a part of the conversation, but if Trump actually starts enacting is catastrophic policies, the Foolhardy Wall, the Unconstitutional Muslim Ban, Alarmist Foreign Policy (possibly including either Russia-loving or going to proxy war with Russia in Syria), Protectionist Economics, and Extreme Blue Collar Job Creation (this is accomplished either through the Massive Infrastructure Investment mentioned above or via Soviet-Style Factory Takeover by the State {or better by local Municipalities}).
3.
Less likely (though not least likely - I won't even present my unlikely scenarios - some of which are quite hopeful and absurdly optimistic), but still a distinct possibility (maybe for example as likely as a Donald Trump presidency!) is that Something Happens. Of course unforeseen things will occur in the course of the next four years. Most of the way that I select a presidential candidate is based on how I think they will deal with the unforeseen. That said, what I mean with #3 is that instead of Trump getting into a room with professional advisors, he acts out. If North Korea launches an attack or China stretches further into the South China Sea - perhaps the Russia/Syria/Iran/ISIS hotbed becomes hotter - a question of a very sudden militaristic response that isn't thought out and can't be taken back.
The Result: Goddess knows, but if anything outrageous were to occur, it may well spark mass protest, from people across the political spectrum. If we have a person with control of the most powerful military in the history of the world who decides to wield it, and in particular who wields it toward un-humanistic outcomes, it will be scary - and a frightening opportunity to unify a seemingly un-unifiable populace.