I'm sure we're going to have a flurry of lawsuits. I'm not a lawyer, I can't interpret which ones will be more effective than the others.
The main thing I personally need to follow- we need to know if there's a stay or pause in the 120 deadline, including the SBR free registration.
I likely will file to get several registered... one of my main concerns was how to pass the ones registered to me, down to my son (I'm mid 50's, and I do have one eye towards "after me" regarding everything I own). As I understand it, if I specify that he receives them in a will, it's a no-cost transfer to him. He would also be registering several, my concern was that he ends up with them all some day. Along with the rest of my stuff.
I suppose the "wise" move, if there are any, would be to keep (at least) one pistol, and register (at least) one SBR per person, if they have multiple. In an AR format, this gives you options both ways.
Unfortunately the window to add braced pistols to a trust is over. A trust is still an option though. You can setup a trust with you and your son on it which will take care of the need for a tax free Form 5 upon your son inheriting NFA items. But you would have to first register any braced pistols as SBRs as an individual and then transfer them to your trust along with paying the $200 tax per item.
As far as the lawsuits go, we will just have to wait for now. Hopefully we get wins in all of the cases.