Your tristate issue is easily solved by obtaining out of state travel permits to all 3 states for 1 full year, free, renew again in a year.
Some of the blame should also go to companies who promoted braces and people who eagerly bought them, even if not “disabled” in any way. Did they really think ATF would not notice or do something? I always thought they are naive.
I don’t see licensing (or banning) of mags as being likely or realistic. Biden would love to do it, but doesn’t have support in Congress. I am sure anti gunners would also love to increase the stamp fee from $200 to $2,000 or $20,000 or some other crazy amount.