I suspect a very basic problem is that I never met anyone into comic books that wasn’t a white kid or guy. I see all these commercials now pushing boys’ toys on girls (Star Wars or Hunger Games weapons, for example); while the intent is clear, I have yet to see a real girl playing with any of these things. Just as many older girls turn away from the STEM stuff pushed on them, young girls don’t want light sabers or bows and arrows for Christmas...
I grew up in a neighborhood full of boys and I had a brother a year and a half younger than I was. When I was nine I asked for a football uniform which I got. I also liked model cars - painting them, putting the decals on them. Loved slot cars. Loved forts and cowboys and Indians.
The problem is that Marvel stopped effectively enforcing any sort of editorial control a long time ago, and as such writers have just run amok and destroyed their IP. Its been unreadable garbage for years now.
The state of Marvel Comics today is far worse that DC was during is New 52 years, and that was a fustercluck beyond all belief.