“What else can they do?”
They can wait.
People aren’t going to take banned items to the range so they will lose competency and be less able to pass their knowledge and interest on to the next generation.
They can cause extra trouble for those involved in “difficult” divorces, when an aggrieved spouse “rats them out” and wants their weapons confiscated because they feel endangered.
They may have an extra charge to levy if banned items are uncovered in pursuit of another violation.
Half of all US marriage ends in divorce. Women overwhelming are bitter and want to punish the man. This will be exploited, bet on it.
Plus the kids will be questioned relentlessly in school and by doctors.
All has been put in place to find who has what.
Bingo. Stifling RKBA is enough for them. May not be enforced, but sales will plummet, usage/practice will end, skills will stagnate, public ostracization will run rampant. “Chilling effect” works.