I wondered if a you tube article was responsible for this post. But the guy on the video said what I believe is true. "2nd half of last century .32acp declined. Currently near to nothing."
.32acp is not dead but is a dying caliber in this country. Why, the guy provides a good argument why. No offense to those who own and shoot them, I still doubt there is an "increased interest". I have owned dying and dead calibers including the .32acp. If its what you want, go for it.
Again, not a partisan for .32ACP, but I'd make three points:
1. If .32 was running at a 0.15% interest level, and more recently moved up to a 0.30% level, that would be a doubling of interest level. Is it significant? Not really, but an increase is an increase. Whatever anyone decides, Chris Baker makes a very good case for why someone _might_ consider the .32 in place of the .380 for certain limited applications. He reports very good reliability and shootability out of his particular, relatively high round-count, Keltec P32 as a jogging shorts gun, FWIW.
2. More significantly, the .380 was an orphaned stepchild just above the .32 in interest for a very long time until the boom in concealed carry and the consequent interest in small, easily concealed pocket pistols. The development of ballistically improved .32ACP rounds could make it a natural progression in caliber choice in small guns, given that many folks have since found that their small .380 blowbacks are pretty unpleasant to shoot. I find my 7+1 .380 PPK/S somewhat less pleasant to shoot than my 9mm P365 12-rounder. James Reeves may gush about the Beretta 80's-series revival 80X blowback .380 (a fine gun in its own right), but the locked breech P365-380 and Bodyguard 2.0 are easier to shoot well (well, the 2.0 maybe not quite as much - I own both) and are much more compact to boot. .32ACP may be becoming the "new .380" for more and more people, or it may end up spiraling down into near-oblivion again. I don't think which is clear yet.
(Update: I recently noticed that Beretta (along the lines of Walther below) has released a .32ACP 80X Cheetah.)
3. Walther had what they considered some good reason to have brought back the PPK/S & PP in .32ACP a decade after they dropped them from the line. I suspect it was increased interest in the softer-shooting and ballistically-improved round, given the experience of many with their blowback .380's.