It may not be that simple. Read this book available for free download here:
To Shake Their Guns in the Tyrant’s Face: Libertarian Political Violence and the Origins of the Militia Movement
University of Michigan Press, 2011
Robert H. Churchill
It covers the history of the 2nd Amendment and the term “militia” in some detail, as well as describing subsequent uses of militias in later times up to the present day.
The problem is there were two sets (at least) of people trying to frame the Constitution. They didn’t see eye-to-eye on the wording of much of it. This makes interpreting the final version much more difficult than it should be. This is the result of the difference between the time of the Revolution and the time the Constitution was actually written. This was considerable political turmoil subsequent to the Revolution and the factions that emerged weren’t as clear cut as “the Founders” term would suggest.
I agree that no one would be dumb enough to suggest that banning firearms at any time in the future was likely during this period. Nonetheless here we are and the framers aren’t here to argue the point. As a result of their leaving room for “interpretations”, our supposed “right” is threatened.
In the end, it’s pretty much like every other “right” in the Constitution: if you’re not prepared to defend it, you’ll lose it, because in the end without active support it’s just words on paper – interpreted words on paper at that.