As a practical matter, that's true but ONLY if we the people have the GUTS to carry thru on the implied warning and I don't think that's the case anymore.
There is the "check" of armed conflict present in the writings of the Framers and plenty of the searing rhetoric is there, to be sure! But again, nowhere in the infrastructure of the Constitution is there any mention of armed revolution using the implements of the 2nd Amendment as the people's liberty teeth. That is simply an inference.
Guess what? If this USSC case is decided against us, a giant step will be taken in the direction of world government because the last barrier to keep government in check will become fractured and may possibly fall. In fact, I would think it might fall into the ashes of history within our lifetime.
Hopefully we won't have to find out. Hell of a thing isn't it? But remember the American Revolution did not spring full born on April 19th, 1775. There were years of build up, with increasingly restrictive laws, and increasing arrogance on the part of the British Parliament. Even after April of '75, the farmers were fighting for their rights as Englishmen, not to fight a revolution. It took 15 months of war to convince them that they should be fighting a revolution, not just a rebellion. Even then, only about 1/3 of the people actively supported Independence, 1/3 wanted to remain Englishmen, and 1/3 just wanted to be left alone, by both sides.
Today, we see what kind of havoc relatively small numbers of insurgents can create. And those are a bunch of camel humpers, most with little education and no ability to create anything, they even have to import "Improvised" Explosive Devices. Fewer relative numbers of more sophisticated "insurgents" could make a heck of a mess here. Which again is something NOT to wished for.