I don't think the right to bear arms is sacred. The FF wrote the constitution to be interpretable and malleable over time. The Supreme Court can interpret when things are open to interpretation, but I still would argue that this one in particular isn't. They hadn't foreseen how large and divided America would actually grow when they wrote the thing, so the bar they have set for a constitutional ammendment seems insurmountable in modern times. Which is why they keep trying to get a precedent for gun law set by the Court.
One thing is for certain. The same men who were afraid to allow the commoners nominate presidential candidates and the senate (originally senators were appointed by members of the House, and the Electoral College was a protection against the commoner) certainly didn't foresee the second ammendment enabling every commoner to carry a hand weapon.
However, the misconstruement of the right to overthrow your government as the right to maintain a personal armament is now so ingrained in some parts of America's psyche that it will take a 50 year long grass roots assault to fix.