Unactive players should have some kind of punishment for leaving the team to their luck. Since matches aren't really long I think it should be good to have a "hard" punishment for them, teammwork is very important on this game so, devs should put a lot on effort to make people to play properly to avoid frustrating matches.
I have told to some of my friends about the idea of a "bonus boost" that will remain active onward a match when a player gets kick, so both teams will be in fair conditions, aside of also getting a bot player. They didn't exactly agree to that... But what do you think about this? Could work? I really hopes this problem gets solved the best way possible! Thanks!