Thanks for bringing this up. A very cool concept. I am quite surprised that sports have been rather slow to evolve in the Information (or "Digital") Age, especially for a multi-billion dollar enterprise such as the NFL. Other than replay which, as we all know, is often fraught with controversy.
I often wonder why there is so much left for officials to interpret. Why not insert a micro-chip into the football to precisely determine the advancement of the football? For example, did the ball break the plane at the goal line? Or, what is the correct distance to a 1st down? Hell, we put a man on the moon 50 years ago, yet guys still trot out with down and distance chains??
Don't get me wrong, I am not advocating eliminating officials. But with all that the striped shirts have on their plate with infractions given the speed of the game, you'd think "ball spotting" could be one less decision with which to burden them.