Obviously, it's a stretch to blame this on the game -- doing anything for 15 hours straight with no sleep or food won't be good for your health. There were millions of people who played this very same game this weekend (some probably even for the same amount of time or more) and had no problems at all -- they realize that to stay healthy, you take breaks, get sleep, and eat healthy. But this kid (and his parents) didn't do things correctly, and as a result, he ended up in the hospital.
Hopefully the kid's all right, and the parents have learned their lesson: they have decided to limit his time in front of the computer, which is exactly what they should do if he can't limit it himself. The article ends by saying that "teenagers" around the world are playing the new expansion, except that the average age of gamers is now up to just under 30, and the average World of Warcraft player is actually older than that. Fortunately, the vast majority of them know how to enjoy the game and stay safe and healthy at the same time.