I don't want Hotaru to sacrafice herself I want Natsume, Hotaru, Mikan and Ruka to be together in the future and LIVE HAPPILY FREAKIN AFTER!!!!
Maybe they will, but not quite how we wanted them to be. It's still unclear what will happen to Hotaru if she alters the past in order to save Natsume. It could be something bitter-sweet, like being sent into the future/past, losing her memories plus everyone forgetting about her and then Mikan and Hotaru meet again.