Infractions seem to be a bit random on these forums. I remember, for example, someone get infracted for claiming that AMD production is of poor quality in Intel vs AMD thread.
Anyways, back on topic, "WoW killer" has never been pronounced nor indicated by a single MMO developer. The quotes BenBos showed don't really mean anything other than the fact that the developers tried to pull some of the WoW crowd to their games - which would be weird if they didn't. Unfortunately, when people are annoyed, when they are tired of one game being the only "godlike" game out there for years, they start getting impatient and, with wishful thinking, start labeling every major upcoming MMO as "the game that will finally place a dead blow on WoW". Of course chances of that happening are slim: even if there is a MMO released that is 10 times better than WoW in every single aspect, still many people have invested so much time in WoW that they won't abandon the game completely, at least, for a couple of years.
I never understood all this fuzz about "game killers" anyway. When I look forward to a new game, I just want a good game. I don't want this game to ruin some other game, I would prefer both games to be great and successful. IMO, it would be ridiculous, say, to label Dragon Age 3 as "Mass Effect killer", this doesn't make any sense.