I don't buy the whole "high play rate lowers winrate" argument
If this was the case, win rates would actually go down the more a champion is played, but unfortunately that isn't the case. Lucian is currently sitting at a 44% play rate, and he still maintains a 53% win rate. We also have Ezreal, another popular champion, and he's only at a 47% win rate. Not played as much as Lucian, but still very high play rate. Ahri is played more than any other mid laner in this game, and she has a higher win rate than 99% of them. I could keep listing examples, but you get the point. So, when we talk about balance, please don't bring up play rates. They're completely irrelevant.
http://champion.gg/statistics/#?sortBy=general.playPercent&order=descend