I do not doubt that less people own guns than did in 1950.
There were lots of social trends that encouraged a decline in gun ownership from that time and up until very recently.
However I have seen polls that show a light rebound in the years 2011-2013. Anyone with a detailed insight?
I doubt that
fewer1 people own guns than in 1950.
Now I wouldn't be surprised if a smaller percentage of people and households own guns, but given population gains in this country, fewer people owning guns is almost impossible.
Further, the younger generation is interested in guns for more than just hunting (in response to points made in the article) because whether you hunt or not, guns are
fun. I think we are seeing a shift in gun culture away from hunters to "self defense" (I put that in quotes because many of these people are in it for the fun, with the side benefit of self-defense). This helps explain the explosion in popularity of the "evil black rifles" and the associated accessories and magazines (the paper kind).
[1] (That's a little grammar lesson, Micro, that most Americans get wrong. If something can be counted, e.g. people, you use fewer, rather than less when describing a smaller number of them. Less is used with items that are not counted, but may be measured, like flour. For example: fewer bullets, less lead. )