Masteries 8,9, and 10

I recently got most of my fav champs to Mastery 7 and wondered: "Wouldn't it be cool to continue the Mastery hunt?". While the ideas that came to mind might not end up being the best; I still wanted to share. Mastery 8 would be unlockable once you have a really high amount of experience, think about a really high balanced number. Mastery 9 would work with the champion identity (this one I think is really cool), for example: would be able to get Mastery 9 if he Tanked a certain amount of damage; would get it if he gets a certain amount of kills/deals enough damage. Finally, Mastery 10 would be after earning 3 to 5 S+, maybe 5 is too much, which would be extremely difficult but would still show you have the superior mastery with that champ. While all three are interchangeable, I do think players need more room to express their champion power and three more sets of masteries would be great; plus 10 feels of a more complete number than 7.