I think that his post as a whole was better. In fact, I suppose my post would better serve as an side to Yvain's. Also, I think I ran with the whole immortality thing more than he did. I believe I addressed more potential issues, or at least blabbered on for longer about them. I do think it is an important issue, because a world like this has serious consequences. Namely, utilitarian like theories break down. Nick Bostrom wrought a good paper on this sort of thing (ethics in an infinite universe), though he didn't present a viable solution. SO on the one hand you have proper immortality,and on the other you don't have a decent ethical system. Frankly, I'm not sure I would even want a world like this, if it doesn't allow ethics.