After Madara and Obito are out of the storyline for good, Sasuke will still hate Konaha. Sasuke will offer Naruto a chance to spare Konaha if he defeats him in a one on one battle at the Valley of Death. Sasuke is fully aware of the Senju and Uchiha destiny, which means he is also aware that Naruto will defeat him because according to the manga Senju's always prevail. Sasuke wouldn't want to live anymore because he knows the truth about his clan. His mother, father, brother, and his entire clan are all dead and he would like to join them in peace. This is basically Sasuke's way of commiting suicide, but instead of having a boring death he will die by the hands of his comrade and the strongest ninja in the world. Too bad we will not see this fight because Kishimoto will then troll us for a final time by doing a massive time skip and show some down the line generation similar to Naruto and Sasuke ready to fight at the Valley of Death but instead of the two statue's with Hashirama and Madara on them, there would be a two new one's with Naruto and Sasuke ready to clash until the end.