So, given the revelations in 646, I think there is enough information now to guess at Sasuke's intentions. As the Ten-Tails is the origin and source of all chakra, it's possible that it's destruction would mean the end of chakra. This explains why Sasuke seemed intent on destroying the Ten-Tails and 'erasing' Naruto. It also fits perfectly with his desire to end the 'twisted' shinobi system. Also, Madara's belief that shinobi simply made the problem of war and hatred worse could be a bit of foreshadowing on Kishi's part. Who knows, though?