I would like to clarify what I meant in my first post. My comment was not about WoW being or not being an RPG, as it is. My comment was about what most of the people there do, and think they are playing an RPG.
Let me break it down in another way. Let's say you have a soccer field. It is designed to play soccer, it has soccer balls for playing soccer, and the game of soccer has its set rules. The people that play soccer follow the rules pretty closely. They are playing a soccer game.
Now, take that same field and fill it with people who think the rules for soccer are 'stupid' and 'pointless'. They grab the ball with their hands, use it to hit other players, see who can kick it higher, etc. Put all those people in the soccer field. The field is still a soccer field, and the people playing still think they are playing on a soccer field, but is it really a soccer game anymore if no one is playing soccer? And does it leave room for those people who are still trying to play by the rules?
That is what I meant by 'most people' in WoW, as most people are playing in an RPG, but they are not playing the RPG aspect of the game, only the MMO.
Edit: If everyone would have gone by "do what is most popular and gets the most people", then many of the 'greats' in our history would not have existed.