a hell of repetiton, yes, but not ENDLESS repetition. The horn showed us that: There can be variations. Sure: He will have to live through countless lives to finally meet his goal, but he WILL meet his goal, and then all will be good. This time, it's the horn. Next time, he'll keep his fingers. The one after that, he kills Rhea when he has the chance, and so on and so forth until finally, his journey is flawless and all his choices are the correct ones. Then he will climb the tower, and the final room will open for him, and all that was wrong in the world will be set right.