This was brought up in the Elder Scrolls MMO thread and I thought it might be interesting to discuss on its own.

A lot of new MMOs have claimed to be "WoW killers" and none have succeeded. What would an MMO need to actually dethrone World of Warcraft?

Personally I don't think anything will until Blizzard's new MMO. WoW has just got such a huge community built up by this point that it isn't going to be put down unless Blizz is the one who does the job.

What do you guys think?