Just to bring everyone up to speed, the current interpretation of the 2nd Amendment is that the whole spiel about a militia is basically irrelevant. Source: Supreme Court decision in DC v. Heller (2008).

Love it or hate it, them's the facts. That said, plenty of other decisions have been overturned at a later date. Like the one that made black people less than equal to whites in Dredd Scott v. Sanford or the endorsement of segregation in Plessy v. Ferguson. So things might change at some point.