itsmydamnation
Veteran
There a only so much that can be done, for a wide FOV with conventional optics you have to have a large screen, and space for the optics.
The camera gives them an absolute reference for position tracking, without it it's very hard to eliminate yaw creep.
they said they look at multipule systems, magnets, kennect style systems but in the end a camera and IR are currently winning because of the low latency of the tracking. the Oculus guy said for consumer kit they want 20ms from input to puxel change, the current demo is 30-40ms.