"Prohibition" was not in the Bill of Rights. It was a Constitutional Amendment. Only the first ten are the Bill of Rights, and they can not be changed via Constitutional Amendment.
Granted: the 19th, and the Amendment that revoked it, were not in the original ten AMENDMENTS.
But the Bill of Rights are "merely" (slight exaggeration there!) Amendments to the Constitution itself. We have previous Amendments that radically change Constitutional procedures: as significant as the change to require direct voting of the Senators!
So, where are the words that actually prohibit removing the 2nd Amendment... and how do you justify prohibiting an new "Amendment" that either removes those words prohibiting removal of the 2nd, or simnply changes the 2nd to allow "only the government" to have guns "for the protection of the people."? You KNOW the mass media could get 1/2 the population to suport that... given enough time and pressure on the "kids" in public schools.
Example: Wouldn't this amendment have passed by popular demand IF the terrorists on 9/11 had USED even ONE gun in their hijackings?