It's not so much that I shrug it off as inconsequential as that I take no pity on politicians who go out of their way to try to rob people of their civil rights and then raise hell when they get an (in this case, particularly effective) 'fuck you' in response to their trouble. I feel particularly strongly about this given that the politicians raising hell are the same ones that were perfectly fine with the ATF/DoJ forcing gun shops to sell to known buyers for Mexican drug cartels and also helped see to it that no one but the whistle-blowers got punished for the deaths that resulted from that atrocity.
Now with that said, time will tell if it will be used in a successful assassination attempt, but I do have some doubts about that. Keep in mind that even given the assumption of it remaining undetectable (i.e. no advances in technology improving to detect, say, a nail required to fire it) and cheap and easy access to a 3-D printer and any colors you please (you can print it out cheaply at a library, but the shape is so notorious that the idea of no one noticing and raising any alarms seems unlikely and with the kinds of funds required to buy one of the damn things a would-be assassin also has the money to set up a less risky operation than that, say, hiring a sniper), this is not a weapon which will be useful for shots requiring any level of marksmanship (i.e. anything beyond a few feet) and it takes some really damn poor security to let someone get that close to a president with a piss-poor imitation of a security camera and no press credentials to give evidence of their identity and purpose for being there. They don't just let any random person walk straight up to politicians with a video camera or large bag in hand. It is possible in theory, but I don't think it's particularly likely.