This is just excessive and not fair to players who'd like a bit of diversity in the number of champions who get skins. Are you okay with alienating the Yorick players or Cassiopeia players or Jarvan IV players who'd like a new skin just because they make up such a small percentage of the playerbase?
With the release of Kayn, there are now 137 champions in League of Legends. You have 137 children, Riot. It's poor parenting to play favorites with your children just because a small handful are high achievers while a couple of them are a bit antisocial and struggle to make friends.