Champion Masteries and Ranked (IDEA)

Okay, so we know the new champion mastery system is coming out. Why not have it be more impactful to the game other than just a side system? For example, if you wanted to play Nautilus in ranked, you would have to have a certain level in champion masteries.

This would ensure that people who are playing that champion in ranked haven't just bought that champion, and would help gameplay. I know this isn't a perfect idea, but I think it's worth mentioning and would definitely affect ranked in a positive manner.