I don't think this would be that hard to implement. 3 votes to 1 for the troll in question and they get booted and get a typical dodge penalty. Obviously it wouldn't be available for 3/4-man premades trying to bully whoever is stuck with them. It's frustrating the amount of instalockers (with the role called and picked already) I've seen today; its just no fun and it another example of the kind of behavior that Riot wants to remove.
On another note...did they reset normal elo too by any chance? This weekend was an absolutely toxic experience in this game for me. I've had the worst players imaginable...the likes of zerker greaves skarner. In normals I'm usually against gold players with the occasional plat but I've had nothing of the sort this weekend.
this will never be implemented the griefing potential is way too high
How? If you are in solo queue, that means there is at most 2 duo queues and a solo queue....so I don't really see how someone could be collaborated against like they could if they were the last man with a 4-man premade. Again, only for solo queue. It's a bunch of people that don't know each other, so really the only way to get collaborated against is if you're doing the griefing yourself. No system is perfect but I think something like this would be good for solo queue.
I am on the fence about whether it should be in ranked or not though. I could see people trying to get themselves kicked for whatever reason rather than dodging which would slow the process of getting in a game quite a bit.