So.
There are a total of 2 NEW models on there…and they are both from S&W, whose name is on the cartridge, and so have a vested interest in keeping it going.
No dealers in my area will take a .40 in trade, or as a sale, unless you want to give it away for pennies on the dollar.
.38 special has been around for 125 years, give or take.
I doubt .40 will make half of that.
That's in your area. .40 sells online, on Gunbroker, on firearm forums, and LGS have them in my area. What sells in one area might not sell in another. For example, single action revolvers and level rifles would sit in my area compared to "assault rifles," PCC, and more tactical and modern firearms. There's a demographic of men in my area that prefers .40, .45, or 10mm over a 380acp or 9mm. Other than that, the LGS and pawn shops in my area give pennies on the dollar for all the guns they buy, which is why I only do F2F sales or sell online.
It's more popular than .327sig, .32 cals, 44mag 44spl, and it's a staple round. 22lr, 380acp, 9mm, 40s&w, and 10mm will be long after we are. Yes, it's not nearly as popular as it once was, but it's still a popular round that's still in circulation. There are still a plethora of ammo options that exist and can be found at most retailers who sell handgun ammo. There were polls on GlockTalk and TheHighRoad.org, and the overwhelming majority of participants owned and/or carried a .40.
Yes, there are two new models, quite a few models that have been around for years, and Glock has brought 40s&w into the Gen 5. Then there's the fact that many USPSA shooters use 40s&w. While it lost popularity to 9mm when law enforcement switched, there's still a large demographic of people who own or prefer .40.