I suppose that it might be nice to have him completely renounce his former behavior onscreen. However, I never quite cared enough about his character to be concerned with what happened him. If he bonds a spren it would serve him right if he became an edgedancer or the like. I don't think that it would be a reward, because he is unlikely to view a need to follow a creed as a reward. This being said if he dropped off the earth I would never notice it. He was always a meh villain in my book. I never hated him. I never felt anything really. He is a scared little man who was looking after his own interests period.