Suppressors are a C3 item, & relevant to the '34 NFA Act, whereby states have latitude to decide whether or not to allow individuals to own them. The CCW movement is approaching national recognition all on its own power, though it would be a kick in the nuts for East-coast state politicians in NJ, NY, MA, etc. to have to relinquish their (unconstitutional) prohibition of it. A machine gun ban repeal would be a hard sell at best; probably bring out all kinds of hysteria. It's already obvious how inaccurate, deceptive, & downright fraudulent the news coverage of the AWB expiration has been, so it would only get worse over MG legalization. e.g. I just watched a report on CNN (Paula Zahn) where the story reporter stated that
grenade launchers had been outlawed under the '94 AWB. Can't wait to get mine this coming Monday.
As for the SCOTUS, well they've already shown their derision for the particular subject matter, as they turned down a review of Sylviera v. Lockyer, the most pointed inquest into the original intent & meaning of the 2nd Amend; a point-blank, 10-ring 2nd Amendment case if one ever existed. In essence, the 'Holy Grail' of firearm certiorari petitions, & it was turned away w/ mute reply.
I think this all makes the writing on the wall is pretty plain as far as the Justices are concerned: gun rights will be determined on the basis of popular opinion, not Constitutional recognition. Sad, but true.
Want have an effect on opinions about firearms? Take people out to shoot. Make friends. Expose them to the fun this right/hobby offers, then talk about the significance of the 2nd Amendment, & let the wheels spin.