Hi Fifth Element. Let me clarify something and then (briefly) explicate my view on this. First of all, I did not insult anyone except for the World of Warcraft itself, which is not a person therefore not insulted (or so I hope!). If I had implied that players of WoW were deliberately "killing imagination" it would have been an insult (of sorts). What I was saying, or at least meant to imply, is that World of Warcraft--and games like it--actually kill, or at least atrophy, imagination.
Now obviously there is an implication that could be read into this, that players of WoW have less imagination than non-players. This is something I wouldn't even try to prove, even if I wanted to (which I don't). But I don't think it is a stretch to conjecture that the imaginative faculties of someone before hours and hours of play are greater than after, if only subtly. Long-term play is more of a concern, and can be highly detrimental to one's imagination.