1) As of now, has Trump done anything that would cause the people who voted for him to not vote for him again (I understand it's still early, purely a theoretical question)? I say ... no not really.
2) Have the Democrats done anything to make themselves look worse than they did before the election? I say ... yes they have basically imploded.
3) Is Trump the favorite for 2020?
In 2008, the divisiveness of the election was strong enough to get it's own South Park episode:
https://en.wikipedia.org/wiki/About_Last_Night..._(South_Park). Obviously, the 2016 election has caused an even bigger upheaval than 2008.
4) Are we going to witness the same relative increase in divisiveness in the next 8 years that we saw from 2008 to now?