some guys will probably slap me for this
but i think the last battle will be Naruto vs Madara. Naruto will face Sasuke... but the only way to beat someone who possess (even if its only a portion) the power of the SO6P is to be equal to that.
So I see it possible that after Naruto vs Sasuke, they'll become friends, but Sasuke will die somehow giving his eyes to Naruto.
And what do you get if you combine Uchiha DNA + Senju/Uzumaki DNA + EMS?
Yes...Rinnegan. I don't like Naruto to have this much power, in a way I think i'll spoil the manga. But if you look at it open minded. It does make sense in a way.
If it happens, Naruto probably won't get the Rinnegan but the kind of eyes the SO6P's son has. The
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that look exactly like the
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. Or maybe even the
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, because of the Kyuubi's Chakra.
*please note that i made up the name sharinnegan myself, it's not stated that it's named this way