I don't know about you, but if it were possible to learn something from the games I play (read: games that aren't shitty), I think that would be wonderful. I'm not talking about math blaster and abc games, but stuff that could be helpful in life. I think it would be most easily accomplished with RPG's, for a myriad of subjects.
Let's say you want to learn to speak Japanese... well, picking up a book or taking a class will help, but it won't help much. Imagine if there were a game where you had to actually learn the language (basics, and advanced stuff if so desired) to be able to progress. I think it's possible, and while I have no kind of ambition to submit the idea to any company, it'd be killer to actually pick some stuff up while enjoying my games.