You are correct. Just like the Wright Brothers' airplane was no threat to the armies of the time. That changed, though, in just a few years.
The legal PRECEDENT being set, however, that a citizen has the right to possess, publish, and acquire information (software) which can be used to create firearms, will still be in place in 5, 10 and 20 years, when the technology of machine manufacturing has advanced considerably from what can be done today.
People will always fine the way to make weapons, even the Una bomber made a crude gun out of junk parts he found or bought at flea markets. It actually did fire
Technology will always change and improve, CNC machines are getting cheaper, 3D Printers are getting better. I am not even arguing that you can’t have the designs or even make the designs. I just don’t look at this guy as any sort of hero or crusader because the case would have taken place regardless of Cody’s involvement.