As i stated above, something along the lines of the video, but reanimated to look better. Which maybe could then fit into the cartoonish style, But seeing as how the new map will look, it doesn't look as cartoonish anymore. A slider will definitely help or just a switch on and off for gore or no gore. If you've played Yasuo, everytime he attacks, there is a small amount of blood, and gore, just not too much. It fits, imo.
I for one think league is evolving, especially with this new map, even though it's just a graphics and visual update. Right now, league looks very cartoonish and childish(not saying all games are childish). That's one of the reasons why i've stopped playing league, but got back to it recently to see all the changes. And especially with the introduction of the new summoners rift, it just makes me more excited to come back to it.
And also, the characters back from years ago, such as season one champions, they're getting visual updates as well. But i guess i'm going somewhere else with this, all i'm trying to say is, there is always room for change.