To me it's a shame Riot is refusing to implement this, or even try it large scale. For some obscur reason they believe there is a moral responsability in a video game to put everyone in a toxic environment to "maybe" save "someday" and reform 5% of true toxic people ? How many other players with be influenced by the toxic one and become toxic whereas they were "normal" before ? What about the other players right to play in a healthy environment ?
- For me you should just have a "toxicity mmr", evolving in time, and play with people nearly toxic as you are. If you behave better than your team, you improve.
- For queue time, same as with normal mmr, extand mmr research range over time.
- For cooperation and trolling, you have what you deserve, so what's wrong ?
And again, it's only a video game, you're not like a government with moral responsability to save your people. They can just stop playing and do something else :).
(Or if not implementing this is just about the money cause those 5% may stop playing & buying that's a really sick reason)