Champion Masteries! Update Idea?

I hit mastery 5 with a my fav champs long ago. Can we get an expansion of the champion masteries? I could see some sort of military-esk ranking past level 5. Or, maybe there could be game modes created were you could pick your champ and 1v1 another person with the same interests. A true showing of champion mastery, based off your comparison to other players.