I'm actually hopping that the shadow manages to turn someone, hopeful a well known character as i would really like some awesome twist at the end of these books. I had thought about Taim and this but i dunno, it seems to me like Taim probably turned himself when he lost all his power, following the "great lord of the dark" was a way to regain that power. Tuon was an interesting idea, that never even crossed my mind, i forgot she could learn to channel and is therefore able to be turned. I'm hoping we get to see this in towers of midnight but i honestly think this will be be in the very last book (unless someone has already been turned) as a major scene.