Mastery Level Standard for Ranked Games

I've played one too many games where a player does not have any normal games on a champ but plays it anyways and feeds. The result is usually obvious, the whole team has to suffer through at least 20 mins of defeat. Isn't it about time to put into place a system where you must have Mastery Level of at least 3 or 4 for a certain champ in order to play on ranked games?