I think we will see increased violence, assassinations of Republican politicians, and perhaps kidnappings on right-leaning journalists. In extremis, they may even attempt an assassination of the President, or in collusion with their overseas jihadi friends, attempt a mass murder/casualty event against Republican politicians or Trump supporters. (In fact, I think the Las Vegas massacre was the latter, but it was hushed up because the Left feared a massive backlash and civil war.)
The Left has no moral anchor except their own hurt feelings, outrage, and envy. Anything, even murder, in their cause is legitimate in their eyes.
I expect the 60s and 70s bombings and violence to resume a la Sam Melville, Dohrn, Weather Underground, Ayers, Hoffman, et al.