Greetings, All,
The .41 Mag is my most favorite pistol caliber, period!! I have "a few" various ones of them


with an American Derringer .41 on the small end, and a T/C Contender with a 14" barrel, on the top end. "A few" others in between, too!

The .41 is a strong, easy to shoot caliber, that can do just about anything that needs be done with a handgun, IMHO, given proper loads and a practiced shooter. Yes, it's best to handload, but even if you couldn't you can get the old Police load, still, and also Winchester Silvertips, both of which are outstanding self-defense loads. And, if you want something that would be considered a "burn the hair off a bear" load, get some from Buffalo Bore, or a few other such companies!!
Do I think the .41 is becoming more popular, well, yes. Why on earth would S&W remake and offer the stellar M58, in both nickel and blued, otherwise? I'd love to buy a new 58, but already own one, NIB, which I bought many years ago. I'm not a fan of the IL, and as far as I know in CA, we have to have that "feature" on our S&W revolvers. (Lord, let us move to a more common sense State, one of these days!!!!)
But, getting back to the original questions, yes, I think the .41 is gaining steam, and I'm glad to see it happen! One of the very best calibers out there, and I dearly love my S&W's in .41 Mag!! Take care, and God Bless!
Every Good Wish,
Doc