This problem is already going away with "inside out tracking". Many of the Windows Mixed Reality headsets already do this, no external sensors to calibrate as w

This problem is already going away with "inside out tracking". Many of the Windows Mixed Reality headsets already do this, no external sensors to calibrate as with the Vive/Rift. Oculus have already demonstrated prototypes with inside out tracking. I think VR has many other problems, but this one will largely go away very soon.