I wouldn't have wanted them to kill Seven but if they did kill her it would make zero sense that the Admiral would go back in time to save her only to get her killed again. She'd just hafta go back in time again and start over. Using time travel to get home seemed like a bit of a cheat. I agree with DevilEyes that having 2 Janeways so one could be killed was having cake and eating it. But I really liked the Admiral Janeway character so I think I can forgive Endgame's cheating. For me C/7 was the worst part of the episode, I did like how shocked Captain Janeway sounded when she heard Seven and Chakotay would get married though.