World Of Warcraft Crushing PC Game Industry?

Age of Empires co-creator and Iron Lore co-founder Brian Sullivan has been discussing his studio's first game, Titan Quest, but along the way has openly wondered whether World Of Warcraft's success is part of the reason for the decline of the PC retail game market. Sullivan commented: 'For retail PC games, I think the biggest problem is World of Warcraft... It is such a compelling MMO game that it sucks up a lot of money and time that would normally be spent on other retail PC games.' Does WoW's growth actually mean that PC games in other non-MMO genres may sell fewer copies?