First, yes, JJ2 Will get boring after a while. However, it has been around for nearly FIVE YEARS, and will probably be around for longer.
Second, this is in no way a "Teen Fad". A decent amount of the players, if not the majority, are not teens, and the word "Fad" usually applies to things that are more popular.
Third, just because something is bound to get boring after a while, is no reason to try to destroy it before its time.