I think we will see electronic helmets in the next 10 years. Not only integrated cameras but the QB will have game and play clocks, down and distance, and be able to see the play being called from the sideline in a HUD. The technology is so small now there is just no reason not to add it. Just makes sense to me to have this communication capabilities. Hell, it would be cool if they had diagrams of every play that you could see pop up on the screen when the play is sent to the QB. Could change the way you watch the game.
And before someone says it, they already prevent teams from having a live TV broadcast so it wouldn't affect defensive play calling, although I could see teams not wanting to share their entire playbook and have it pop up on the screen "Madden style" for scouting.