Yeah, the problem wasn't making their line-up more diverse, the problem was that it started feeling like Marvel was treating it more like a marketing gimmick rather than a legit desire to diversify.
Like, when they did it with Carol, they were really just protecting the Captain Marvel trademark; and while the book was never a big seller, it brought in the mythical new readers and likely is what started Marvel down this path, leading to Ms. Marvel becoming a breakout character and then to the new Thor being an outright hit. But by that point, it feels like Marvel saw dollar signs and didn't actually pay attention to the surrounding circumstances of WHY those changes were popular. So we wound up with, off the top of my head
Iron Man (twice!)
All being new characters (or at least sharing the name with a new character), plus stuff like Iceman being outed.
Unfortunately, that idea loses it's impact after a few goes, and what felt like an organic growth then feels like it got targeted by the corporate overlords for mass production.
Edited by Undead Scottsman, 21 October 2017 - 05:43 AM.