Why yes, of course the .40 S&W is dead. Nobody owns any anymore. Nobody makes ammunition for it. Parents shun children who deny the death of .40 S&W, divorces are filed, FBI agents whom in private say .40 "wasn't so bad" get reassigned to TSA in Gander, Newfoundland.
But .40 S&W is not alone. 9 Parabellum is dead, those fancy avant-garde 5.7x28s and .40 S&W killed them a decade ago. People with nines are regularly held on 72 hour Psych evaluations due to thier caliber choice.
And .38 Special is dead. Those nines killed .38 in the civilian world...
Likewise .45 acp is dead, also a victim of the nine.
.357 dead, too loud, .44 Maggie likewise. .460, .41, .327, anything NAA, dead before it hit the market. .44 Colt, .44 Special, dead back when Grandpa was a youngin.
.32acp, 5.7x28 eurotrash.
What is left?
.22LR, preferably loaded with BP.