World of Warcraft "addiction" is just one of these non-issues that is sensationalist enough for daytime TV talk-shows, without being serious enough to actually worry the spectator. Good that over here in Europe we don't get the Tyra Banks Show, because they just had an incredibly bad episode on WoW addiction.
Excellent review and opinion piece written on that at Taking the Mickey. I couldn't have said it better, and so I don't. :)