It's more likely, if we lost, that they'd simply let us out ourselves over time, or leave our gats in the attic.
I can't see any future where the authorities are able to go door-to-door for disarmament. Not because they wouldn't like to, mind; they wish they could do exactly that. But I find the logistical/pragmatic argument compelling: there is simply no way they can do an effective door-to-door search in any community in this country, manpower-wise. Especially if they're worried about getting capped, and they'd have to believe a non-zero percentage of owners would resist.
I just can't see it happening.