I don't think the League community will get any better in terms of toxicity. The community itself is considered one of the most toxic, if not the most toxic gaming community compared to even communities like Call of Duty. I do understand that you're trying to make it so League won't have a toxic community, but that simply can't happen because of factors such as:
1: The game is competitive, and competition tends to bring out the worst in all of us, unless kept in check. Other than the reporting system, there really is no check.
2: The vast majority of the community is around the ages of 13-16 (I'm using 13, because that's the minimum age to play this game, but there could be younger players in the community).
3: Internet anonymity; this ensures that people can be the most reprehensible beings they can get, because there is no repercussions in the end other than a banned account, which is very easy to bypass that by simply making another account.
Those are just some factors in why I don't think that the League community will get better in terms of attitude, but I do think that the community will get progressively worse, even cinching the "most toxic community" award from Call of Duty (though, we already do have some Top 10 channels saying that League is worse than Call of Duty now).
Back in 2011, when I first played, I was 19, I still saw the toxicity in the community, akin to what I saw on Call of Duty, except people typed out what they were feeling, rather than saying it through the mic. Skip forward 6 years, and I can tell you right now that, at least from my perspective, the community has gotten a LOT worse compared to back in 2011. On this account (I'm rusty, because I left League 3 years ago due to real life issues and the community was too toxic), I'm not going to say it's an exaggeration, but I have reported at least 1 player in every single one of my games since making this account because of toxicity, or botting.
The community isn't going to get better, it's only going to get worse. I like your idea of trying to make the community a better place, but given that the League community is so large already, and the recent debacle of a Riot "official" statement wishing death upon a community member, your idea will probably, at most, make a small niche sub-community where the nicer or more tolerable community members will flock to.