Where is the fun, and the challenge? I could see a game where you are a superhero that adopts other superpowers to perform tasks like oh freeze a building, power a machine with electricity. Your idea of exchanging skills seems a little too simple, I am good at golf but then want to be good at football so I change with this guy and do what? Do I actually play the football? Is that part of the game? Is the game solely about asking to exchange, an exchange occurs and then that's it? i guess if the game is about seeking out the person in the first place then that's kind of like pokemon but without any battling.