Hell no. :/ Vayne is perfectly fine where she is and should be "shit tier" because she's supposed to be a mechanically difficult champion. I feel like champions, like Vayne and like Draven, should never logically have higher than a 50% win rate since they are mechanically meant to be difficult. When they do have winrates higher(like Vayne did at the start of season 7), that is a sign that they have been over buffed and anyone is able to pick them up and play them and do well. Its a sign that they are in desperate need of toning down because a mechanically based champion like these two should not be getting 54% win rates with play rates upward of 15-20%.
Which is why I really wish they'd look at Draven. He's creeping into that magical above 50% win rate with a slowly growing play rate. When a champion that is mechanically difficult has been dumbed down to make them easier without any gutting of their kits(that are usually loaded down with things that specifically would make them the best at everything), they are not healthy to the game and completely run everything else over. Why would you play someone like Jinx when you can pick up Vayne instead; she DPS's just as well as Jinx and does true percent health damage while having a tumble and invisibility to make her at least somewhat safer? The answer is because she's harder than Jinx. :/