Need I remind that the difference in popular vote for trumps election this year was only a few hundred thousand, out of millions of votes cast?
Good media propaganda spin could easily keep the momentum going during such a thing.
By this, i mean Trump can swing it along the lines of "Look, I dont like strangling innocent people financially. Just give up your illegals, and things will go back to normal, this isn't hard", and when the cities naturally refuse, he just paints them as radically antigovernment, and anti-america.
Trump got just about the normal number of republican votes that a normal candidate would expect, but he got them from some unexpected places, while Clinton completely failed to even try to get certain voters motivated at all.
It's not just plausible, but probable that a less hated candidate who ran a smarter campaign, or even just listened to Bill, would have gotten a significantly higher share of the votes in the Penn/Ohio/Wisc/Mich areas, going anywhere from just barely winning those states to taking them like they were expected, cutting another half a million or more off Trump and adding it onto the hypothetical smarter/more liked candidate.
Numerous states which were widely expected to lean towards Clinton ended up being very close or tilting in Trump's favor, suggesting the Not!Clinton votes were a significant factor there.
There's no mandate for Trump, there's no groundswell of inexplicable love like there was for the first awful human being who used the "make america great again" line: Reagan.
This year has been full of unlikely, inexplicable, and downright stupid behavior. I'm not going to say that there is no way people would be stupid enough to just accept something like that because they promptly will to prove me wrong, but when the alternative to Trump isn't Clinton I don't think he will do as well.