You know what's really sad about Teemo?
It's not his blind. It's not his shrooms either. It's the fact that whenever his name is spoken, everyone instantly compares him to Satan and Cancer.
Let's look at the facts. Teemo, by his very nature, is a lane bully. Lane bullies take advantage of the time where everyone is comparatively weak. This makes laning against a bully very frustrating, even though you may eventually outscale them. It doesn't help that Teemo is a relatively cheap champion.
Because of that fact, Teemo is usually played by people when they are low level. His adorable face and cheap price draw many new players to him. That means that many other new players encounter him in game, and then realize that they hate him. This process coins Teemo's signature nickname, Satan.
Today, because of that exact reason, it is impossible to suggest any good changes to Teemo. His identity does not allow it. Even though he's not a hard champion to beat, because everyone just plain hates him for existing, Teemo can never be viable. And that, to me, is just sad.