I really doubt they would kill of Shikamaru as Kishi intended him to help raise Kurenai and Asuma's child and be the child's Captain/father figure. I can see Killer Bee dying, so that Naruto is the last Jinchuriki and the last obstacle for madara to win the war. I Think Sasuke is beyond redemption now but i can't see the manga ending with Sasuke still being evil so he'll probably sacrifice himself - i'd rather him just die by Naruto's hand