it can eventually turn into one if the project gets a lot of support. the problem is the current intention is to help occulus rift devs port their games to steam, and VR is a reletively niche audience, so its not going to get the development time it needs if it wants to explode.

tangently related, I do see a future where valve goes the route of game native and opens up steam officially on android, but its not quite there at the moment.