discussion : what's up with Vi's winrate ?

Hi i've been playing Vi for a while now and she's one of the strongest champions in my opinion but lately she's not doing that good... this is not a "buff vi" thread it's just a discussion to know what people think of her in this current meta so here's what i noticed so far : if u check her stats on champion.gg http://champion.gg/champion/Vi -1st of all if we look at her winrate % by patch http://imgur.com/SGjU6I6 her winrate just keeps decreasing with the release of new patches and items and that decrease will most likely keep going -but then if we look at her winrate % by the game length http://imgur.com/WtD9htw the longer the game the higher her winrate because as you all know vi is considered as one of the strongest late game champions in the game.

so how do we relate these 2 facts ? with the new season riot decided to make the game duration really short where a team can snowball with just 2 or 3 kills in the early game and end in less than 20mins if not the enemy team will just ffat20 but did they consider how will this affect the champions that need to make it to the lategame to actually dominate ? they basically just ignored them and didn't even speak of them as far as i know this is the reason of Vi's current drop in her winrate and if this decrease doesn't stop any sooner she'll make it to the bottom of the list in no time