yes, but it depends on the game. it could bring about more console RTS games, replacing the mouse with a motion remote. obviously in first person games they can bring about realism with the weapons, so the remote acting as a gun or sword. also obviously, racing games can use motion controls rather effectively.
however i do not think they should replace current control systems, not by a long shot. if a game is designed specifically for motion controls, fine, but sometimes i want to be able to play sat down, being as lazy as possible. i have gotten used to certain control schemes in a way that it doesn't feel like i'm using a controller, it feels like an extension of myself, and as a result using a controller does not break immersion at all. currently i would say motion controls not registering are more of an immersion breaker, so until they are perfected, they are a nice addition, but not an replacement