Is this the event that will be the trigger?
I doubt this is the event that will make anybody rise up. Not something anybody is going to be willing to die over or seriously disturb their lives over. It's a nice narrow wedge they can push in to get their way and open things up more and more just like they have been doing for so long.
The nibbling away at your rights has been going on for 100+ years and has been so hugely successful, why would they risk it.
All of the standard "Civil Rights" groups such as the ACLU have already decided they won't fight for any rights that are not "politically correct"... so you want to publish works saying how great lusting after kids is?... No problem the ACLU will be right there with your back.... want to talk about freedom to own guns.... they never heard of you..
Same thing with all the SJW group... rights only matter if you are using the rights for the communist SJW agenda...
On the conservative and freedom loving side, many will do all that can be legally done to fight this, but after that, I don't think anybody intelligent will go for actions that are not legal over it, as there is no public support for that, so why ruin your life over it & it wouldn't make a difference anyways.
Also those in the know and with the ability, probably realize that the whole plastic 3D printed guns is more of a joke than anything else at this time & your hardware store has much more interesting materials.
Criminals don't care either because "ghost guns" are a joke, most criminals just get a stolen gun which is available everywhere, even in CA and NY etc, usually at prices well below retail & then they never have to worry about it.
"Ghost Guns" is basically a smoke screen for them wanting to find a way to push universal registration of all law abiding gun owners (while not bothering the criminals), so they can send the LE storm troopers to their house anytime they want and demand them to turn it over (much like they do now in CA, FL, NY and many other states).