The right to bear arms is absolutely not under threat. Gun rights are the strongest they've been in decades, and that will not change until the supreme court drastically changes. Changes to the 2a would take groundswell of political support (super majority in congress or 2/3rds of states ratifying an amendment? but I forget the specifics). Given the political divide in the country, I do not ever expect to see the day. If this law has any teeth I fully expect it to be defanged as soon as they 'break the skin'.
I don't like this; I grew up with guns, but even I find the rabid fetishization of guns to be a sad reflection on our society, but I have precisely zero allusions of any change, any time soon.