This is how I would think it would end.
I can see a huge flash back of these two before the fight begins. Showing how they have grown as ninjas to become what they are. All this build up, All this anticipation for this fight will be shown in that one long flashback. With the emotions running high between the two ninjas. The fight will begin with a long stare down. Both of them being at there most peaked forms. Naruto will right away go for his Rasegan, Where as Sasuke would go for his chidori. Both clashing with one another with a huge bang noise.Then right away Naruto and Sasuke will counter one another by doing there most signature moves. The fight will be a even fight for most part. Each showing of there new abilities and powers. Every fan watching this will be in awe. In the end after doing there most powerful moves. Both of them would be on the ground, not being able to walk. With there last bit of energy, they will get on there feet slowly. Then walk towards each other while limping. Both of them will go for a punch and get punched at the same time. Making them fall on the ground while staring up at the heavens with a smile. Closing there eyes slowly and being saved by team seven.
That fight will change Sasuke completely and make him realize what friendship really means. He will then move on from the past and hope to revive the Uchiha clan again. Where as Naruto will become the New Hokage of the village. Working on making Sasuke's dreams come true.