I want the NFA gone more than anyone, but something would take its place and to be honest.... i don't trust a single politician from either party to have our backs and pass something that actually makes sense. Politicians are all talk and rarely have a spine. They vote for what's in their best interest to stay in power, not what is right for their constituents.
Machine guns aren't in common use because they (US Government) have artificially limited the quantity in the public marketplace. If they weren't so expensive more people would have them.
I'd be happy with the ability to manufacture and add to the registry.