Grandpappy Frostheim would probably say that we, the mass of WoW players, have more options, features, sparkly things, humdingers and thing-a-ma-jigs to help us play than ever before -- and he would be right. But I don't believe that should mean there aren't more features and upgrades to our interface and experience that would improve things even further.
Just in the past year or so, Blizzard has added a ton to our interfaces, including an improved built-in quest helper, built-in power auras, and the remote auction house. These all are great "quality of life" improvements for the majority of players. The remote auction house is one of my favorite new features, as playing the AH is as fun as many other parts of the game for me. I had heard rumors before the remote auction house was released that you'd be able to use your crafting professions remotely as well. This would have enabled me to buy on the AH, craft gear or cut gems, and then sell my finished product, all remotely. I'm sure this would bring me a lot closer to being gold-capped. Oh well, I can dream, can't I?
Most everyone has some idea they feel could be added to improve the gaming experience. Are you one of those still hungering for the dance studio, or is there some other feature you think WoW really needs?