Idea to prevent smurfers and inexperienced players from playing ranked

For all accounts created after this being implemented, once you hit level 30, require 50 normal wins before playing ranked. It is very frustrating to have someone on your team that is brand new to level 30 and "doesn't own a support" , who doesn't understand objectives or mechanics, and can't cs. It is also frustrating to play against smurfs as it often makes people lose crucial games and completely tilts them. Just an idea