It has happened in the past, it will happen again. The past is prologue.
All that you said has valid points. But last time I checked, nukes have been regulated for pretty much as long as they've been around, and it hasn't led to any attempts at kitchen knife regulation (accept on airplanes), which frankly, sounds reasonable to me.
I have zero problems with all citizens not being allowed to ever own a nuke. Zero.
The nuke thing is an extreme case. It doesn't say anything really. How about a cannon? Can a citizen own a cannon? If not, why not? What about dynamite? Black powder? How large of a firearm is too large, and why? You never really did address this before.