I don't believe we are going to see a full-blown civil conflict but I definitely believe we are going to see a significant spike in domestic terrorism (bombings, assassination attempts, kidnappings, etc)
The majority of trump supporters will go home to their right wing echo chambers, seething with impotent rage while not actually taking overt action, but I believe a not insignificant percentage are going to continue with this and attempt to take it to another level. Remember, these are people who in many cases quite literally believe trump was sent by gawd himself to give them religious and cultural dominion over america; that kind of deeply aggrieved religious nuttiness is not just going away with a shoulder shrug and an 'oh well'.
Outside of the US military these are the most highly armed people in the country, by far. I have no idea what percentage of his supporters plan on actively continuing this, but it's definitely not zero, and a huge percentage of those who won't be actively engaged will certainly be cheering them on. Throw together that level of rage, impotence, thuggery, weaponry, add religion... presto.
I'll be frankly shocked if we DON'T see this happening.