i love the thread, i have always thought kishi involved some other religions/myths but you pointed it out quite well (what i wasnt able to put my finger on).
However, my only thing is that i do agree that naruto wont die...but that doesnt mean he doesnt die at some point. I figured they have foreshadowed sasuke and naruto's deaths for a bit but i dont personally believe if kishi killed them off somehow, they would stay killed off. i think someone (maybe tsunade) would pull a chiyo and save them (hopefully not sakura)
however if they did die, it would be sacrificing themselves for the sake of the world and i think sakura would be there with them. i would agree that team 7 would die together in that case.