There are people who jump on the new thing and people who stand buy proven calibers. There will be a big new thing and the 40 will be greatly reduced in popularity. Just my opinion. I don't have a horse in the race so to speak. 308/44mag are the newest caliber that I use. Talk to me in 40 years and if the 40 is as popular then as 9s and 45s are I'll admit I was wrong.
LOL, Chuckle, Chuckle.
The .40 S&W is the big new thing (still).
The 9mm's re-emergence is based on ammo cost, not because it suddenly became more effective than the .40 for serious social situations.