Mastery Levels Beyond 7

Dear Rito, I'm sure all of y'all down at Riot Games are familiar with the process of falling in love with a champion. You just pick them up and everything feels.......right. Like that's the champion you are naturally proficient with, a champion that feels like you knew how to play before even locking it in for the first time. And, of course, you remember how hard you worked to get that champion first to mastery level 5, then ground out those two S- rankings, only to be driven onward with your thirst for total mastery: rank 7. But then you got there.......and then what? I think it would be a relatively easy and very rewarding addition to League of Legends for additional mastery levels to be added. Lord knows how many S+ ratings I've gotten on my level 7 champs, and without further mastery, I don't feel incentivized to play them anymore.