The current SCOTUS isn’t, IMO, unreasonable with respect to guns. Preventing criminals or people with mental health issues from possessing guns is a pragmatic thing that recognizes that people are the real problem. And there are many other societally beneficial pragmatic gun laws in some states that I don’t see SCOTUS ever striking down.
I disagree that there need to be federal gun laws. States can and do regulate what can be transported into and within their borders. Radar detectors, for instance. While the fully automatic weapons ban isn’t, IMO, unreasonable, it should be a state law only, and it is a state law in most states, even though it’s currently redundant given the federal law.
I wouldn’t be surprised to see the current court overturn the federal fully automatic weapons ban at some point, leaving it up to the states. There is no federal speed limit on interstate highways, each state is free to regulate that as they see fit. I see that as an NRA funded outcome of any attempt to create a federal ban on semiautomatic rifles.