I happily carried .40 in my LE career for 25 years. But times have changed.
The same people that used to ask every time a new 9mm was introduced, "When's it coming out in .40?", are the the very same people that dropped .40 like a hot potato once the FBI said they were changing back to 9mm. And 90% of LE dropped the .40 as well.
Truth is, the .40 was a "forced" popularity, based on the FBI adoption and it being the newest shiny object in the gun industry. Most shooters did not like the .40, as the 9mm (and the similar .38 Special in revolvers) was about their limit of recoil tolerance. But god forbid they admitted it, as they didn't want to look like wimps so went along with the program. And those shooters that were .45 fans never saw the point of .40 in any event.
LE agencies found the .40 guns required more preventative maintenance and were breaking sooner, they were spending more money on both ammunition, and getting recruits and officers to qualify. Follow the $$$$$.
Once 9mm became socially acceptable, shooters had some ego coverage to get rid of .40, and they did so in DROVES. My local LGS pre-owned case was chock full of sad and lonely .40 pistols of every description for a couple of years, sold at deep discount.
That same LGS, which does a brisk business, doesn't even stock new .40 pistols anymore. They're dust collectors.
Folks, .40 is dead as a new issue. You'll be able to get ammo for quite some time, S&W will keep their namesake cartridge alive in some catalogued guns, and Glock never seems to discontinue anything....but it's a niche item anymore.
Sometimes, Santa just doesn't deliver.

There are plenty of threads with mindless arguments about calibers and people wanting to tell you why you need to use the caliber they recommend.
Like you, I am former LE. But unlike you, I couldn’t care less what LE carries as I’m fully aware of the ignorance that goes into a department, or especially the FBI, selecting a round.
Are you really suggesting that guys in suits that don’t work the street and rarely are involved in a shooting, are somehow experts on ammunition?
I have a .40 Shield. I’d like to try a .40 Shield Plus. I have no problem controlling a .40S&W. That will have zero impact on what you use. I assure you; they won’t drop your 9mm out of the lineup. It is the most popular handgun caliber there is.
When I see “.40 is dead”, I usually just go on by and pass it off as the silly non-sense it is. But you obviously took the time to write a lengthy response, so I thought it would be rude for me not to reply.
