The concepts of 3D printed guns, or digitally controlled milling machines, or 80% receivers, or any other of the multiple methods which allow the hoi-polloi to create their own guns anonymously, will continue to be of low significance. Such techniques only become important when guns are banned outright. Since that will never happen, it will be a nice niche hobby for a few people who have a few extra bucks to spend.
In a few localities where specific firearms have been "banned", there is some growing interest in these methods. Since those bans are very likely to eventually be overturned by the courts, this marketplace is not apt to grow much.
Anti-gunners will always be inventing yet another scheme to magically make some firearms difficult/impossible to own or operate. Here in the US, these schemes are just not able to get widespread traction; they only are popular amongst a very small number of organizations, and those organizations have extremely limited political power.
As long as we, the law-abiding adult gun owners of the United States, remain vigilant against erosion of our gun rights, outright gun bans will remain a dream of a very small fringe.
