Well, based on the end of RoW, it seems that the path he was on is no longer an option. Being blind, he can't really serve Odium like he used to. Though I could be wrong about that, maybe Odium with give him something that lets him see. (Steelsight?)
As for Voidbinding, I have zero proof. We just don't know enough about it. I like the idea of a kind of reverse Ideal to the Radiants, partially because we could have a really cool term like the Tarnished or the Diminished or something. It just depends on if the Fused, Enlightened Radiants, or something different is using Voidbinding.