I have absolutely no expectation that Trump will actually order the military on the US populace, but even if he tried it matters whether the military would follow such an order. It could always happen, that's part of the reason I wish our federal government was drastically reduced and our standing military disbanded, but I simply can't think so little of our troops that they would actually do it.
That said, if somehow that did happen one day I fully expect to die by their gun. At that point that army becomes an invading force and I'd feel like I have no choice but to fight.
I really hope you are right about that. I worry because I listened to what he said...and he said he wants to use the military against the "enemy from within, and named specific political opponents and mentioned media figures.
I tend to believe him when he says that's what he wants to do. But you are right, one would hope the military would refuse such an unconstitutional order.