It could be Sasuke that dies, not because I don't like him but that's the direction the manga points to. Sasuke is the last Uchiha and their power has caused nothing but trouble over the years starting from Indra to Madara to Obito and then old Sasuke.
If you notice from the manga, Sasuke has been given a power that is negligible in the fight against Kaguya; Kakashi is even performing better; Sasuke's powers are still lacking but Kakashi's has evolved and he is the one stands to be the only hokage with the sharingan. Also, Sasuke is sort of representing the SO6P's brother and he also died.
We also know that Naruto has grown very powerful and his smartness has now been increased to a point that rivals Sasuke's and he has the experience that has been gathered by all the tailed beast and he's there to secure their future where as Sasuke hates them.
The vision never said that Sasuke will lead the world to peace, it said Naruto will do so and he will play with the tailed beasts.
Sasuke will die but he will come back just like his fellow Uchihas (Madara and Obito), they always come back somehow. However, this time he might be possessed by the villain that everyone has been calling for; OROCHIMARU… there's always something in for him.
This is when Naruto will have to fight Sasuke and bring him back trust me, kishi doesn't lay down ideas or hints for no reason.
Kakashi might also die so that Naruto can be the 7th Hokage, or he will remain the 6th Hokage and Naruto will be the overall ruler of all the Alliance put together. He has already shown that he considers them his comrades
Forget everything, it might even be Sakura because she has lost her love for Sasuke a little bit and there are other people that love Sasuke. There's Ino and Karin so Sakura might as well die but I don't think it is likely.