Okay, so customers are not always right. But if you look over recent changes in the game, things like the new druid skins and pending faction transfers, things that don't change core gameplay and aren't "essential" by any means, you might agree that Blizzard has changed its focus away from the purity of the game and into focusing on the customer.
It seems to me, now that we're getting all this stuff, nothing of the game has changed except that it's an overall more pleasant place to be. Yes, class specs and utility and dailies and quests -- they get their regular tweaks, and plenty of folk pick over whether those changes are good or bad.
But the heart of the game, the pure core that so many, even the game's programmers, seemed bent on protecting no matter what -- I think they had it wrong. Not that the game didn't have a core, or that it wasn't important, but what that core was. Refusing to allow transfers from PVE to PVP servers, for example -- things like that maintained a certain purity and control over what the player had the right to do, what the player had earned, and what the game was all about. It defined WoW as something restrictive and elite. The programmers had tailored the game's rules (and features) to reflect their viewpoint of what the game should be. (Something not unlike a hardcore raid guild.)
Lately, the game has become more about fun, options, and just out-and-out enjoying yourself. The hardcores still have their hardcore pursuits (whether you think they've been dumbed down or not), but the moderates and casuals are finally getting some love.
I think the programmers have started to see the game's core as the people instead of the game. So now they give us things we can enjoy just for the sake of enjoyment, and they've made the players the most important thing. And when they do that, no matter what type of playstyle you have, you win.
Please don't argue about what in the game needs to be fixed or how Group A getting what they want means Group B gets shafted. My argument is that Blizzard's focus has changed from narrow to broad and that my game enjoyment has improved because of it. I'll also go as far as saying "No, this change has not and will not destroy WoW." Alarmists are always 100% wrong. This includes me when I get alarmed.