Yup. Pretty much the exact same thing I thought of when I saw Lancer get consumed by his rage. Woulda been an awesome additional storyline or something in Fate/Stay Night where somehow, Lancer was resurrected by the Holy Grail because of his hatred. And upon finally being defeated by Saber he retains his sanity and finally got his uninterrupted duel with the King of Knights. So pretty much...can die in peace with no more regrets.