It is inevitable that a game like WoW will be constantly losing players,
no matter what Blizzard does.
Once you accept this reality, everything else starts to make a bit of sense:
- If WoW never evolved and grew, most people would have stopped playing it more than 7 years ago. It is the very nature of an MMO to keep expanding and adding content, or die.
- Every change will be disliked by some players. Remember if you make no changes, the game dies anyway.
- Over time, every player will end up seeing some changes they dislike. The longer you have been playing, the more certain this becomes.
- Given enough time every single person who ever plays WoW will leave. Either because the changes made to the game are not to their liking, or were insufficient to keep them interested in the game or life circumstances changed to make them unable to continue playing.
So given all of this above, Blizzard doesn't really have much of a choice. They have to recruit new players into the game. They have to try to retain the biggest possible slice of their existing playerbase.
The game you seem to want cannot exist and flaming Blizzard for not making that game is short sighted, because even if you got the game you wanted, it would be dead within a year, which means you still wouldn't have the game you wanted.