Nobody-san already said a lot about RPGs. I would like to add that what drives current gaming is fast-paced action. They are not that interested in the story at all, or, to quote somebody else, “don’t let the story get in the way of the action!” (One of the “top” RPGs lately is Diablo II. Having so much action itself, some hardcore RPG purist does not consider it a RPG at all, but an action game with stats.)
But that’s what the consumer wants, right now. Most ADV games requires the player to read the story, and feel it. The great majority does not seem to want to make such a commitment to a game (or read a lot, may I dare to add).
BTW, won’t it be interesting a RPG based on real life? That is, like trying to get to a University or getting a job based on your stats?