I really do feel Trump's presidency will be a mess and half.
And with the way the popular vote went and how close states like Florida were, and how betrayed the people in the blue states that flipped will feel when he forgets about them, I don't see it for the Republican party in 2020.
The Democrats would REALLY have to **** up (i.e. nominating an establishment hag with extreme personal baggage and a questionable public service record

).