Then probably said players shouldn't play an MMO and go to other types of games. In a literal meaning - WoW is an old style MMO and until Blizard makes some drastic changes (that already happened over the course of the years) this won't ever happen. To me it just seems that players want a game that looks like WoW but it's not WoW, more like an hollow shell of what WoW has been so far.
I mean, i get it's me that's been playing for 17 years and the playerbase has deeply changed. Apparently most people don't care about the world but only about the challenge and bragging rights of beating said challenge.
I don't know if changing how WoW is for the sake of this players is going to be a good decision, but i'm not the one that can say that. If i end not liking how the game is, i'm just going to stop playing. Still doesn't make boosting better - it's again quite literally "i'm gonna pay more to skip the things i don't like". I agree Blizzard can be at fault for designing things that people don't like, but they have the numbers so they design the game according to them.
Oh, and people actually doing Mythic raids and high keys are just a small fraction of the playerbase. They're not the playerbase making them money (but they are often the most vocal and visible ones, so they're basically free advertisement). If anything, Blizzard is losing most players on the middle of the pack, which have always been the bulk of the community (not really sure about now though).
You just want WoW as a different game as it actually is, but since you can pay more to make that happen, you're fine with it.