Sadly, I've noticed that as well. The 2nd Amendment used to be about the National Guard. Now it's about handguns in the home.So, are we losing one part of the reason for the 2nd - the defense against liberty in the majority view and most of the discussion.
We've won, but to quote Al Pacino, this is a battle of inches.
Though the idea of an armed populace as a bulwark against tyranny has been brought up in supporting arguments, all we've gotten from the Supreme Court so far is the right to keep a gun for the "core right" of self-defense of the individual.
I can't really think of a case we could bring that would force the courts to accept the 2nd Amendment as a last resort against tyranny. Frankly, if we have to invoke the right, it may be too late for courts.