I don't see a need for this. Maybe its because I don't have xbox or playstation so I haven't experienced the trophy/achievement system but I feel no need to have it. Any game can have its own in-game system of rewards. I don't see why I would care about getting external ego points for playing through a game. Playing through the game and beating the game is the reward.
I don't mind if Nintendo were to implement this type of thing, but I see no reason they need to do it.