After thinking about this for some time i think i will put forth my conclusion on the MMORPG genre.
The reasons most of the listed games, WOW, Runescape and so on became popular was at that time they were new and cool and just overall THE games to play. This is no longer the case, MMORPG' is an old concept and there are many new concepts out there people would rather try.
At the same time, i think most people without knowing it, go into new MMORPG' expecting to feel that special feeling, the way they feel when they think about the early 2000 of classic WOW and Runescape in the good old days, that feeling that make those games and memories seem special when thinking back. But that feeling, really is just nostalgia, and memories of not just a different time in the gaming community, but also in peoples own lives.
I think a new generation of gamers, who did not experience those starting MMORPG', is needed for the new games of the genre to be succesful.