People have already said it and although it will never happen, they seriously need to blow it up and completely reinvent the game. They likely won't do that because it's too risky and the game still makes big money.
But from a creative/gameplay standpoint Modern WoW is sort of a listless mess. Nobody even knows what type of game it is anymore or the type of game it's even trying to be. It's basically just a skinner box treadmill of "progression" systems with new instanced raids added so often. It's basically like a genreless timewasting mobile game you just play on your PC instead.