I'm not sure if that applies here. Most people "waste" a certain amount of their week on downtime, and that's probably healthy for them. Whereas in ages past that was checkers at the general store or a bard's stories at dinner or listening to the radio, today it's TV and video games. A person who watches 40 hours of TV a week for fun is in just as much trouble as a guy who plays WoW or EVE for 40 hours a week.
True, but at least an interactive game like WoW engages the parts of your mind that are responsible for strategy, social interaction and goal-setting. Not saying it is much better than TV, but I would be willing to bet it's not at the same level of brain-rot.