Of course things would have to go much further than they are now.
But one cannot ever rule out that possibility.
I did think it very disingenuous that Heilman took those poll results to equate to actual right-wing boots on the ground. I'm quite sure that if a poll would have been taken after the 2016 election, you would have had an even higher percentage of people respond that Trump was not legitimately elected, and that violence would be justified to put Hillary in office.
The only difference is that the leftist press didn't bother asking that question after the 2016 election because the answers wouldn't fit their narrative.