Unless you've been razing every village and choosing every corrupt choice you should still be in the clear for a redemption arc. If you razed every village I could understand not being allowed to turn to the light, but if you're playing right (trading with villages instead of destroying them and not stealing and looting) you should be making more coin and have a fairly good reputation.I am not sure that is enough to redeem him after all the nasty things he has done.