And if that 99% of people decide to change the constitution to ban guns? Then what? It would no longer be unconstitutional at that point. If this country keeps moving left at the speed it is now, there might soon be sizable pro-gun control majorities that support doing exactly that.
Right this moment there is no chance of that happening, but the speed of ideological left transformation we are going through is very rapid. Obama is most definitely fundamentally changing this nation, and like it or not the majority of Americans like and support him. Hussein got socialized medicine through when even FDR failed, and won an election after doing it. If he puts effort into banning guns, there is no reason to think that in a few years the majority of elected officials won't go along. So what then?
The U.S. Constitution only enumerates a few of our God-given rights. It is not the source of those rights. If a people become so debased that they agree to abolish government recognition of their inalienable rights, then they've simply chosen slavery over liberty. It then falls to those who reject enslavement to fight for the rights of all.