One important question is what the NRA is going to do. Yes, they have doubled their membership, but that increases the likelihood that they are willing to compromise. Although there is strength in numbers, larger political actors tend to become co-opted; if public opinion, as reported by liberal media, remains anti-gun, then the NRA, in its quest to mobilize resources for self-survival and organizational growth (the two most important goals of ANY organization), will probably compromise. Political science literature suggests again and again that as organizations grow, they become part of the "system" and, thus, less likely to fight that same system that allowed them to grow and prosper.
So, I do not believe that the NRA will be a valuably ally. I like the Internet-based activism idea advocated by others. Let's create informal networks, let's contact our lawmakers, let's contact the media. Grass-roots activism can work! If that fat liberal Michael Moore can get K-Mart to stop carrying handgun ammo, then millions of law-abiding gun owners should have some influence, too! With or without the NRA.