I like a lot that idea.
I had a lot of fun participating to the french nascar proxy championship.
IN that concept, each coach should mail his own playbook too. If you broadcast the game, you can even imagine a direct live confrontation, where the coach can say (on the chat service of ustream, or veetle, or any website like that) what he decide to do.
Imagine this, for example :
Reginald put a I offense formation. I see it on the video. Then, on the chat form (or microphone, I don't know if it's possible) I decide what defense I want to play. Let's say "defense number 3", wich is a 4-3 defense. Reginald watch my playbook (including a precise scheme with numbers and all the stuff), and put my defense on the formation I choosed. Then, he controls the game, like in a normal solitaire game.
A sort of hybrid between solitaire (the coach is alone to operate the game and teams) and "classic" 1 on 1 game.
If we want to keep that thing on a real solitaire play, just keep the personal playbooks, and roll dice to decide the formations.
Everyone have a PC and at least a webcam. We can imagine tutorials to put all that online and operate this type of game.
edit : we can also use that direct live gaming concept in another way : the home coach could operate teams of other coaches only, and play as a sort of referee. Like on a 100% dice ruled solitaire gaming (I know a lot of solitaire players like to play that way and watch the games as a spectator).
So the playbooks could stay secret if we manage a clever schedule. Imagine Reginald vs dimitri, in Dogwood stadium. Dogwood has our playbooks, so on the schedule we should never play against him. But we can receive his team and confront it to iron Eagle's one. Etc, etc... Rough ideas I throw here until I forget them
If we separate the mailing league in 2 conferences, we could play a season perfectly fair with that system.
I believe that system has also a lot of potential to surpass the frontiers and distances, even not in solitaire based gameplay.