Instead of nerfing Lee Sin they should rebalance him because of his popularity yet low winrate
I'm all for nerfing him straight up, but I feel like it would be better for everyone if he was rebalanced in some way to be less punishing for the enemy while somewhat less forgiving if you don't do everything perfectly. I also feel like he doesn't have a clear niche or purpose currently, which is why he is somewhat outclassed by Jarvan/Vi/Rek'Sai even tho he should be bringing something completely different to the table.
His passive feels tacked on and so does his W2. Why not focus most of his power into those things? Give his passive bonus damage based on AD. Take away some damage from his Q and R. etc.,