I don't think that's a very smart solution. I think the smarter solution would be to add a "vote to kick" option in the que. This way, trolls are punished, not the players.
If you go into ranked que alone, you would need 4 votes to kick the troll out. Of course, the troll is then put on a 30 minute waiting period, increasing every time he is kicked out, 30, 1 hr, 1 1/2 hr and so forth.
If you go into ranked duo que, and you are the target to be voted out, your duo partner won't even get to vote, to deal with duo trolls.
This system seems fair to me anyways, and I don't think you can just get 3 other random people to gang up on one guy you never met before, suggesting that would get you kicked out. This seems like a very fair system to me, and it should be added to the game so it makes ranked games smoother and almost troll-free, of course this feature should NOT be added to normal ques. Who cares about normal ques? normal que is their to mess around not following the meta.