Trollers in Ranked

Hi there. For about an hour ago, i had a match, where the first sentence typed in chat was "Yasou or Troll". The other team banned yasou, and he picked Urgot jungle whit teleport and Cleanse. Nobody wanted to leave, so 5 sec before the game started, i did. I lost lp, and i am very angry about the way ranked is. I dont think its fair that players troll if they dont get there role. Thats why im happy about the new ranked in Season 6, where there will be less trolls in ranked, becuase everybody can get almost what they want. But how will the bans be? Will there still be 3? 4? or are there even bans?