I mean Sasuke mastered the Curse Seal which is basically Sage mode, Sasuke has contract with the snakes just like Kabuto and Orochimaru, I don't see why Sasuke doesn't want to learn and master Sage mode.
Imagine a Dragon Sage mode Sasuke, that look cool, maybe he look similar to Curse seal level 2 Sasuke.
There nothing stopping Sasuke learning Sage mode, Naruto learned Sage mode when Sasuke was stronger, what the prove of this simple, when Sakura, Naruto and Yamato were battling Sasuke, Sasuke demolished the team easy.
Sasuke > Naruto at that time, so now that Sasuke is stronger than before there no reason why Sasuke can't learn Sage mode.
Imagine a Dragon Sage mode Sasuke, that look cool, maybe he look similar to Curse seal level 2 Sasuke.
There nothing stopping Sasuke learning Sage mode, Naruto learned Sage mode when Sasuke was stronger, what the prove of this simple, when Sakura, Naruto and Yamato were battling Sasuke, Sasuke demolished the team easy.
Sasuke > Naruto at that time, so now that Sasuke is stronger than before there no reason why Sasuke can't learn Sage mode.