Do you think this five year old will grow-up a loner with no social life and an aggressive behavior. I didn't think so either!!
Gaming is a hobby as much as reading, watching TV, studying (to some it is!), playing chess or any other type of activity. It does not prevent someone from doing sports, playing outside or other physical activities. Playing a console or PC game for 15 hours a day, is unhealthy, so is playing chess, or reading, or watching TV for the same amount of time!
Remember, everything in moderation is good for you. Well, almost everything that is!