Current Rift dev kit owner here, the device isn't really what you would expect. The screen connects to a box that then does either DVI or HDMI out as well as USB for the head tracking. This box also needs separate power from an outlet. So its not really ready for a mobile experience.

Additionally resolution just isn't there yet. They're currently testing better screens for the consumer version but its all a matter of what they can source (as with the dev kit they had to move from a 5in to 7in screen due to sourcing problems).

Finally, before I received mine I had thought about using it similarly to how you are. However I've come to realize that strapping a TV to you face changes up the interaction enough that you sometime have to rethink fundamental design concepts about the UI.

Random Rift tidbit: The people behind the [Minecrift](https://github.com/mabrowning/minecrift) are doing some awesome work and its development is a great example of people learning how to adapt a game to VR. Plus the ascetics of minecraft makes the pixelation of the Rift less noticeable.