Riot your recent balance changes will make people lose interest in Worlds.
Worlds, (and other competitive games for that matter), should be a direct mirror to casual play and the extremes that people can push the system in their favor. By nerfing/buffing specific champions specifically for Worlds, you have created an artificial game that isn't representative of the game people have been playing.
People won't look at Worlds and think, "Jeez, these people are amazing, look how mobile Kayne has been with his ganks and look how far that champion is being pushed to get those results!" The reason people won't say that is because you will realise a large reason why he is performing well in that game, (or why he's even being played), is because you - Riot - buffed him, ONLY for that niche timeline at Worlds. Kayne at Worlds isn't a representation of Kayne this season, and Sejuani sure as shit isn't either.
Stop buffing/nerfing the champions you want to see at Worlds Riot, and let competitive always be mirror to casual play and how far the people can push it, because we don't want to see the fucking champions you want to see a Worlds, we want to see the champions we have been playing with/against at Worlds.