Kishimoto said neither sasuke or naruto would die, in an interview.
But this is a good possibility of Naruto gettin Sasuke's sharingan. You need Uchiha and Senju cells to get Rinnegan, if i'm not mistaken. Now I wonder, does Itachi, when he put the crow into Naruto, implemented some Uchiha cells there? Could Naruto end with Rinnegan?