If Naruto killed Sasuke (which he won't) he could just take Sasuke's eyes and then have the power of the SotSP. Or he could take Madara's eyes and develop the upgrade himself.

This is turning out to be a real shitty ending. We've got what, 4 chapters left to not only conclude this fight but also free the tailed beasts, free the world from the Mugen Tsukoyomi, tell everyone what happened, decide who will be Hokage (remmeber Tsuande isn't dead yet so no guarantee anyone new will be crowned), establish a new Village system or alliance and set up a legacy for the future.

Either there is going to be a Naruto Z/GT after this, or this will be incredibly rushed, particularly when you consider relatively minor fights like those between Sakura/Chio and Sasori took so long.