It's an interesting thought. I don't see the Democrats hopping on that boat nationally any more than I see the Republicans supporting the 1st Amendment right to flag burning though. This is an issue that will be publicly positioned against but will vary depending on voter Demographics. In the Chicago collar counties most Republicans are fiscal conservatives (if that still really applies for the party) but social liberals so not even they support the 2nd Amendment to any degree.
We need that perfect moderate, mainstream Libertarian party to win one or two, whenever such a beast comes into existence

I interviewed a guy from Cato about some of the energy related business/public issues that are going on and after the formal part I asked him about libertarian political chances. We didn't talk about the 2nd Amendment, but he said on social issues, as hard as it was for him to say it, it made more sense to vote Democrat these days. Both parties are intrusive, both are for big government, big welfare (corporate vs. citizen), Republican spending is out of control, the Patriot Act, gay marriage, drug laws, etc. Didn’t seem to consider the likelihood of a pure libertarian push in government, but more which party more embraced the libertarian ideal. He wasn't really happy with the Democrats by any means, but he was really concerned about the intrusiveness of the Republican right. He felt it was barely the lesser of two evils, and seemed pained to say it.
Charon