As a constitutionalist, my friends give me grief when I say the 2nd needs to be amended. 250 years from now, it's not inconceivable that single shot nuke pistols or some other type of star wars weapon exists. If we are going to find alternative energy sources, we are going to find new and shiny weapons using those sources. The fact that the 2nd clearly states these rights shall not be infringed means each citizen will have a right to those weapons.
I'm not a fan of working around the constitution though, if we continue to do that, then no, the document will mean nothing. If we follow the amendment process, then the document is sustainable.