hecarim hasnt been a god tier pick for that long..... its been like 2 months...
also.. "OMG SOMEONE HAS A POSITIVE WINRATE!!!! CALL THE RITO POLICE AND HAVE THEM ARRESTED". screw off, winrates dont really mean anything. the only time riot needs to look at a champion because of winrate is when they get 56+%. if we nerfed every champ that had a 51% winrate riot would be nerfing almost every champ every single fucking patch.
Also since you care SOOOOOO much about winrate, why are you calling for a hecarim nerf, he as a 52.5% winrate. that really isnt that high. its 2.5% above 50/50.
so lets break down the champs you dont want to play against.
Cait - Cait is a lane bully with a lot of range. makes her strong against most other adc's and she becomes an issue to deal with if you play like an idiot. 52.23% winrate.
Darius - Lane bully who is strong in the early game but starts to fall off a bit later (fall off doesnt mean becomes useless, it means they arnt as dominate as they were) 51.9% winrate
Hecarim - Strong early game jungler, Starts of kinda strong, then power spikes at sheen, then trinity. very good all round jungler. Needs minor Tweaks to E damage 52.51% winrate
Kat - Dances around and is a pain in the ass to deal with, strong in most parts of the game now due to not being ult reliant. 48.04% winrate
Leblanc - basically an easier katarina. 49.82% winrate
Lee Sin - The definition of a jungler. Possibly the most overloaded one to ever exist. always has been god tier, probably always will be. 49.9% winrate
Poppy - Due to lethality and the lack of understanding the community has towards it tanks are becoming pretty fucking insane. 51.22% top, 49.26% jungle
Shyvana - insane damage while building tank. welcome to season 7. (also fuck everyone who says "oh she is a fighter". if she builds 4 tank items and tank boots she is a tank.) 52.36% winrate
Yasuo - dances around like an asshole and one shots you. 50.25% top, 49.56% mid.
Vayne - "Mechanics" *mashes q repeatedly and then rubs her dick because she is "good at the game" 50.68% winrate
Zyra - support that can still take out half the adc's hp with like 2 abilities 51.96% winrate
As you can see some of the most annoying champs in the game have 50% or lower winrates. This is why winrates mean nothing. While most champions on this list could use a nerf (vayne just needs the pink ward Trinket upgrade brought back) its not because of their winrates.