From this point onward the only people dying are Madara and Obito, the rest of the white Zetsu army, spiral Zetsu and Black Zetsu(if you consider them people that is)
Kakashi has already been through enough in his life. He deserves some sort of break - not more death. He has to be alive after the war in order to show the audience that you can live through all sorts of pain and suffering. Also I doubt Kishimoto would kill off one of the main characters - if Gai can 'survive' 8 gates I dont see anyone from the good side dying anymore - especially with Naruto's god powers.