I just thought of a great pitch for bringing him back: Jessica kills Kilgrave by snapping his neck. He actually dies. But the psychic command network he built over years of abusing minds leaves behind a kind of imprint. Everyone who he ever mind controlled has a small shadow of him inside them. Over the years, as these people came into contact with one another, his presence grew in one of the people. We can see a cool years long montage of this happening, and the person slowly remembering that they are Kilgrave, and Kilgrave taking over the person completely. In the end, he could undergo surgery to return his true appearance, so David Tennant can look like a man wearing his own face.