sasuke will not be moved with words. naruto has played that card already, and it didn't work. its easy to say, but hard to fully know and understand if that person's really sincere, despite the fact, that person may very well be sincere. that's why naruto let that go a long time ago, and has found a new way.they must do battle to the extent of near death experience, in order to fully grasp that understanding between one another. like the valley of the end.
now, I'm not saying that there will be no talking involved at all, but this will be that spark that turns the evil to good. i just hope that they don't end up dieing in the process.