Michigan police are confiscating guns from people whose “registration” was not renewed.
During hurricane Katrina, quite a few private firearms were confiscated, though this did lead to passage of some laws saying that they could not do that again.
I'd say we have a mixed response. If the confiscations are incremental enough, and against small numbers of people at a time, and ignored by the MSM, they can get away with it.
What I see as the greater danger is the creeping delegitimization of the ownership of weapons. I remember when you could buy an anti-aircraft gun and ammunition through the mail. We had low crime rates. Now you need government permission to buy a single shot .22 rifle (unless it is from a private party, and they are demonizing that!).
I agree with your point about "creeping delegitimization" in the very long run.