For I have been thinking about designing a game that would handle the problem of game "addiction". I am still brewing the idea, but the basic concept is that you would have to do things in real life in order to progress in some parts of the game. The game would have to start locally (if it doesn't have enormous budget) and spread from city to city.
Part of the game would be played on your pc, but then you would get a quest where you had to drink three beers in one of bars we have contract with, another example of quest would be to walk 3 miles each day for a week. Naturally you could progress down different questlines which fit your lifestyle (visiting bars and clubs, jogging and hiking, eating at restaurants...) but all the questlines would require some parts finished in game and some of them in real life which in this case is also ingame. I have different concepts of applying this to the game and even if this dream becomes reality it won't happen soon. But one day I might actually get to producing it.