The future I see for the Democratic Party
Northeast Coast
West Coast
With Maine, New Hampshire and Oregon as toss ups
That suggests a political reality much like China today -- with the non-Communist partners marginalized. The Democrats will be allowed to show that there is some formal, if ineffective opposition.
In any event, if you think Obama was bad, at least he was cautious; he coordinated well with the intelligence agencies and the Armed Forces; he spoke simply but with necessary nuance; he acted without malice; he showed great respect for legal precedents and Constitutional formalities. None of that will be so with Donald Trump. So what are his virtues?
He can get America into deep trouble. He can stop inflation only by suppressing wages as his Corporate buddies want, only for the consumer economy to collapse. See also Herbert Hoover. Failing to pay attention to the Intelligence Services and Armed Forces ensures that he has more chance of a 9/11 or Pearl Harbor-style incident than he has of resolving one (think of Obama resolving 9/11 by delivering a dead Osama bin Laden to Davy Jones' locker). This is Jimmy Carter without the moral compass, and the moral compass is all that Jimmy Carter had. Because he has nothing to say to those who voted against him is "Suck it up, losers!" or something to that effect, he will get people who dislike his policies to street demonstrations and protests on many issues from minority rights to the environment.
The only way in which Donald Trump or his successor has a chance to win the Presidency in 2020 is if the Republicans succeed in rigging the vote. Basically, if Republicans win in 2020 it will in part be because people fear horrible consequences for opposing the sort of leader whose image is in every living room, bedroom, and kitchen.