The number of guns owned by private citizens has increased greatly. I know several people who own more than 20 guns, rifles and shotguns.
People do not buy guns based on "policies".They buy guns based on fear, and perhaps greed, since guns tend to increase in value, unlike other things. The gun collectors I know believe that their guns are an "investment". This may or may not be true. It is only an investment when you have sold something for a profit. Prior to that, unless the rate of return is guaranteed, it is a form of speculation.
Again, I do not think it would be possible to confiscate as many guns as there are without causing more problems than than are caused by the abundance of guns.