Suggestion: Require 20 normal draft-queue games before allowing ranked play
I just played a game where a player offered to trade for blitz, and instead of asking what the other player wanted, picked a champion that a third player was planning to play. Also, he never bothered trading.
I never know what the deal is in these situations. I usually assume trolling or some other terrible behavior, but maybe he was new and didn't know how champion swap worked, and didn't know the usual draft queue etiquette. Maybe it was his first ranked game.
That got me thinking, why not require that players, who want to play ranked, play a certain amount of normal draft-queue games first? It'd get them used to the champion banning/selection/swapping process before they touch ranked. PLUS, it'd weed out the yolo-casuals that decide to jump into ranked games here and there, without any real desire to cooperate with the rest of the team.
People that really care to play competitively wouldn't mind having to reach that minimum before starting ranked. Those that can't be bothered with that shouldn't be playing ranked anyway.