At the beginning it will be all about games, but once the technology is good enough (Gen 3/4) it will transition to be the universal computer interface (replacing standard monitors).
There are more types of entertainment than games. It's easy to imagine VR Concerts, VR Sightseeing, and VR Movies / Television. There are also many practical VR uses that the immersiveness will add to: 3d modeling, real estate/architectural tours, teleconferences, remote debugging, systems design / modeling.
