Well, ultimately it comes down to a question for the US military: On orders from President Trump, are you willing to violate your oath to the Constitution, and to shoot US citizens? If the answer is "yes", then it's over. But if the answer is "no"...
the generals who make the decisions and who could depose the great leader are already being replaced. Will the foot soldiers remember their oath to the constitution? given how the majority of them are proper Maga, I'm not convinced they will side with the people. the military and law enforcement are there first and foremost to serve the oligarchs, not the people, no matter what a piece of paper says.
There's a lot of layers in between. Lower-level generals (I mean those below the Joint Chiefs and heads of services), colonels, majors, lieutenants. All of them have an oath to the Constitution. They aren't all MAGA. Are they going to follow the Constitution, or the President?