Seems gimickie too me. I could see it for training your eye to pick up movements on a fastball but I don't think I like for football.
If they can develop the tech to where a coach can go into a virtual playing field with his players and stop/pause/rewind/highlight elements, it would be infinitely valuable. Imagine the blackshirts and Diaco all in a room in VR and Diaco is in the middle of "live" game action showing players how to pick up route trees and stunt and blitz and such.
I imagine this could have done Tommy Armstrong some good for reading defenses with no risk of injury.
As if it's going to translate to the field that easily.
http://www.si.com/nfl/2015/08/17/ap-fbo-virtual-reality-training
"When it's time for the test, Buchanan can look around just like in real life, with a complete 360-degree field of vision. He hears the play call from a coach or another player and then checks the formation and reads the defense pre-snap. After the ball is snapped, he watches how the defense reacts and then turns his head to the player he wants to receive the ball.
If it's the right choice, the ball flies through the air and connects with the receiver. If not, the simulator informs the QB a wrong decision has been made."
It's not a perfect system yet, but as far as I can tell it doesn't count against your limited on-field practice time so. . .no-brainer.