While this is sad, anything in excess is can be harmful. I do believe in exercise, and try not to sit at a desk either working or gaming too long at one time. However, I would bet that many more people have died from exercise, or over-exercising, than from gaming. And how many people die from hunting accidents, or football head injuries, or skiing accidents, etc?
So bottom line, everything has risks and bad things can happen. Just seems sort of unfair that when it is related to gaming, one isolated incident, however sad, gets so much publicity.