Well, I don't remember Indra and Asura killing each other. Am I wrong? I thought they just waged war against each other putting a burden on the next generations. Naruto might mean that he will finally resolve the issue once and for all. Well, its funny that their deaths would actually be a pretty solid resolution since they both never had kids and that would be the end of their bloodlines.
I'm just speculating though. Overall I agree with you. We all know for sure that both Naruto and Sakura won't die, at least they are okay in two years (in the movie). OR IS THE MOVIE AN ALTERNATIVE UNIVERSE?? Nah.
What I was saying is that Sasuke's death might not be off the table completely, but so very unlikely it is even hard to imagine it. (But the possibility of his death might be the reason we don't see concept arts of future Sasuke for The Last movie. They don't want to spoil the tension of the situation either way.)
Still, according to 485, Naruto seems to want to break Sasuke with sheer willpower and physical pressure. To exaust him, to make him feel despair and break his overconfidence. Until Sasuke accepts NAruto as an equal or a superior, he won't listen. In this showdown we will see Naruto actually winning a match against Sasuke for the first time, not just persuading Sasuke to do right. I also think that means that Sakura won't be a part of the fight. If she helped it wouldn't be an equal fight.
I imagine a scene where Sasuke takes Sakura hostage in an act of desperation. That would be too low even for Sasuke. He might destroy his own moral by this action itself. And then Naruto would tell something like ("remeber who you are" - high five for the Lion King reference) and Sasuke will let Sakura go and crumble.
When you say the part I bolded, you mean to get through to him, right? Naruto knows that Sasuke has been going through a lot and has been pushed down a path of darkness, but it seems that he wants to try to convince him otherwise and help him out. He doesn't want to see Sasuke get hurt and wants to do whatever he can to save him from himself.
I actually think Sasuke taking Sakura hostage might be possible. He wants to do whatever he can to get his way, so if that's a way to get to Naruto, then so be it. It'll be interesting, either way I think. And really angsty.
