First step to an antidote.
I think the new hextech system will be a truly impactful step to removing toxicity from the game. I think you should at least lose all chest privileges for the month though, not just unable to earn while banned. I mean what's a one week ban when I only need to earn 4 chests and I'll still have 3 weeks to do it? Better yet, if you get punished the next four chests you open are punishment chests that contain lumps of coal. This way you don't have people who go back to being jerks after they get their four chests or at the end of the month.