Honestly, I'm not entirely opposed to norms being turned into a prisoner's island. I enjoy playing ranked, but I struggle to find the desire to play more than one consecutive game after watching my team verbally beat each other to the point of typing in chat more than playing the game. I don't know if that experience is as common in mid-to-high elo as it is in low elo, but anymore it just seems more and more frequent.
Implementation would surely be dangerous, but I wouldn't be opposed to Riot testing it for some time. Perhaps, now that we have two queues for ranked, restricting one for a period of testing allowing only players who have never been punished or players dedicated to reforming themselves. I don't get mad often, and I don't see myself getting banned for my occasional outbursts (small and rare in comparison to some chats I've read), but even if I did receive a ban, I could see myself working much harder to reform and "escape the island". I think it would at least be worth some experimentation even if it was just for a month or so.