What's that saying, "Diversity breeds adversity" ?
Hardcore comicbook fans are all in their late 30s and early 40s now. The industry knew this and attempted to secure the SJW market, thinking they would be able to fill in the age gap created when comics went to shit the kids stopped caring.
The age of comics has passed and comics as an industry will die. We are witnessing a midlife crisis but the person having the midlife crisis failed to accomplish what they wanted to do so, leaving doubt for their future.
Quite frankly I'm not concerned about comics dying. Death is the only suitable punishment for traitors. Liberals clap when you act progressive, but they'll NEVER support you and buy your shit.
The problem is it was outside forces DEMANDING Marvel push for diversity rathar than the fans themselves. It's like if Porsche was being pushed to make a cheap, affordable car. It would be nothing like what the current Porsche owners drive, and they'd end up not buying the cheap one anyway since it's trash.
To further add to my post, Mange is still going strong despite being the same media format and ironically enough is more diverse in it's offering of genres and stories even though they're all created by the Japanese. Though part of it is probably the difference in mainstream culture. Manga is just another form of entertainment available and accessable most everywhere. While comics are pigeonholed into only specialty shops that deal in nothing but comics and "geek" or "nerdy" stuff. You'll be hard pressed to find a comic to conveinence or grocery stores like before.
Meanwhile diversity itself doesn't seem like the main culprit here. X-men and other older comic stories were championed as diverse and inclusive. The main difference here is that back then each character had their own identity to build, their own story. Nowadays all they do is rip off the costume of an already very well-established here and slap it on some nobody and expect everybody to instantly love it. Doesn't work like that, but then again comics especially superhero comics already have a problem with never ending stories that constantly retcons itself because they're too scared to kill the cash cow, even long running mangas have a clear beginning and end.