Viable? A threat to occulus rift? It certainly sounds interesting, but most "stories" like this do. (Comes off a little paid for).
https://news.ycombinator.com/item?id=3265255
http://www.hitl.washington.edu/research/vrd/
I think it's languishing in patent-encumbered hell at the moment. There used to be videos showing soldiers using it as a HUD-style visual aid.
Viable? A threat to occulus rift? It certainly sounds interesting, but most "stories" like this do. (Comes off a little paid for).