Very late to most of this thread, and it's too long now for me to review all that's been said. Personally, I don't own a gun, don't want to own one, had a guard job in college where I had to carry a loaded revolver and never got attached to the sucker. Would it bother me if all the guns on earth disappeared. Not a bit. Do I think our Constitution is going to change any time soon, no. Do I think we have a lot to fear from our government the way the Founding Father's felt at the time that they were writing. No, but I never say never.
But, if one looks at the language of the 2nd amendment, it seems to me that some specific conclusions can be reached and some matters of definition arrived at. As to conclusions, the language seems much more directed to the right to bear arms in some organized fashion as a means to keep the government from taking advantage of the population. As such, it does not necessarily support using weapons to do anything but that. But okay, so it gets silly to think that an argument would succeed that disallows weapons from being used for the manly sport of animal hunting while the supermarket is down the block, or to have some sort of weapon around the house . So the conclusion is relatively easily reached that so long as the Amendment exists, the citizens must be allowed the right to have arms.
The language in the Amendment refers to "arms", not guns. So it is legitimate to look at what the Founders considered to be "arms" and argue that only the sort of "arms" that they knew are allowed. Muskets, cannons, bow and arrow, single shot pistols, a knife or a sword.
But that would be an absurd conclusion, right? So one should then look at the modern equivalent to give meaning to the word "arms". And to effectuate the meaning of the whole Amendment as assuring the right of citizens to combat a tyrannical government, the word "arms" logically means having at the citizens ready disposal, all "arms" necessary to counter the "arms" that the tyrannical government might have. "Arms" then, as properly interpreted under the Constitution does not guarantee us the mere right to own guns, but the right to own bombers, tanks, drones, bombs of every strength, etc etc. How else can we defend ourselves against the power of the tyrant? Otherwise, it want us to wage a doomed resistance. So, I'm out shopping for a tank to replace my Prius.
Of course, I've had too much wine to be thinking clearly, but I've wondered, for all of the enlightened who think we are allowed the right to own "arms" because we need to be able to keep the government in line, how do you feel about Kent State, for example. (Read up about May 1970 if you don't know what I'm referring to.) Those damned stupid students almost cost me the right to take my bar exam. What could they possibly have been doing? Oh yeah, exercising their right of assembly and speech. Would the folks who think that we can oppose a tyrannical government have agreed that any student who shot back and killed a Guardsmen had a perfect defense under the 2nd Amendment that they were doing what the Constitution permitted? Who decides when that right is being exercised properly or not? Um, I think it's that same tyrant.
If this country does not at long last give the finger to the NRA and impose sensible gun laws that do not deprive hunters of their joy, or the folks who need a loaded gun at the ready to deter the armed intruder (probably keeping the loaded weapon in a place the law frowns on as being too accessible) I fear we will never have the will.