The father didn't blame gaming per-se. He did say that his son sat and played it for hours and that there is a danger from it. I had recently read a medical study that stated that the sitting position is more dangerous than anyone ever thought http://health.yahoo.net/experts/menshealth/most-dangerous-thing-youll-do-all-day
I don't think movement controllers like the Wii, Kinect or Move will do much to alleviate the problem. It's all on the gamer to get up and move around at least once an hour.