Starting with the uprising of games like Wii Sports, Wii fit and Rock Band people got more invested into games that try to teach you skills from the 'outside world' rather than sticking to the old principle of making a game for the sake of making a game which is just fun to play.  
Of cause that's nothing that was forced upon us, people just seem to like working out in their living rooms or playing fake guitars from their couches. 
As the whole instrument game genre hasn't reached its climax yet you can definitely see a tendency to realism. Instruments get more complex and the drum sets already seem to be quite close to real ones. Apple already showed that it's possible to make a music program that will actually teach you to play an instrument with GarageBand, which works really well but isn't a lot of fun yet. 
With Microsoft's upcoming motion sensing technology Kinect more developers jump on the train to "move yo ass land". With Harmonix Dance Central people get to know what it's like to be on the dance floor. There was Just Dance for Wii before but in my opinion Sony's and Nintendo's motion controllers look kind of last century compared to the whole camera thing from MS.  
I am very interested in how this is going to develop and what skills you'll be able to acquire from future games (I am looking forward to Ninja Gaiden 3 where I'll learn how to snap some necks, hurray!!!)  
Maybe they will make you a well trained dancer, guitarist, keyboard player, drummer, chef, surgeon, dentist, killer, robot vampire! - Hell yeah!