It all depends on the laws that could be passed.
If they really wanted to put a hurt on our hobby, then they could ban the importation of ammo and then tax the crap out of US production. That would really slow down the gun crowd.
They could also do a total stop of the importation of ALL parts kits. Not just barrels. They would mean a US manufacturer would start making more AK parts.
I don't see them do much with the ban of weapons, I do see them doing something with ammunition.