IF Trump loses...and there is no doubt this is his election to lose, Biden won't win it:
I think a lot right-wingers will be back in a spot they enjoy, in a painful way--that of being oppressed by a Democrat. Gun sales went way up under Obama, the NRA was riding high. I imagine Fox and talk-radio do just fine when there is a Democrat in the office, as all the righties tune in to get their daily fear-driven teeth-gnashing.
I think Christians will be full of righteous anger because this is the time to take over the Supreme Court for decades. The ultimate goal of course being to outlaw abortion. My entire extended family is largely a one-issue voting block, this being it, although they also greatly fear illegals and antifa and gays and BLM too, and 100% support the police in all they do.
There will be angry militia types doing stuff, but they do that already.
I don't know anyone personally that supports Trump that I'd give more than the time of day to at this point, so I could give two shits how mad they might get. They are mad all the time anyway. They have their reality with their own facts, and I have mine, and we both think it's the only one. Ain't gonna change!