I'm curious to know how far down below the floor that thing actually extends. If it had to be directly embedded into a floor (for safety so that no one accidentally walks off the end, trips down a step and smashes their skull in, or because it actually extends like a good foot downward) I highly doubt we would see this enter many people's homes. Something like this would need to be a literal mat no thicker than a thick rug before it would actually be commercially viable. Also, VR still hasn't fixed the whole motion sickness issue, and this looks like it would further exacerbate that.
Definitely cool tech, but far from refined.