Champion Mastery Levels

Since Mastery level 7 have been out for quite a while now, I've always wondered if there will be a final mastery upgrade. My idea has always been that if Mastery level 8 came out, you could only use it once for each role. So considering that there 19 marksmen, excluding Teemo, Graves, and Kindred. One cal only use the upgrade on one of those champions, and so on with other roles. So to simplify all of this. Are we ever getting a level 8 Mastery update?
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