Ignoring whatever the hell Oculus is trying to do until their motion controllers come out, roomscale VR experiences are fundamentally different from anything that can be done on a 2D (or 3D) monitor. VR isn't at the stage where it can replace monitors for standard computer usage, but it isn't trying to do so.
If the number of active devices is too low for Nest to justify continue running the service, then they can do a "buy back" or replace it with a similar Nest device.