I think the rest of the fight is gonna go like this. Everyone on the good side is gonna panic wondering how they will defeat this thing. Blah blah blah, flashback or something. The bad guys are gonna give them words of discouragement as always, blah blah blah. Then something will make Naruto remember that only the Sage of Six Paths could have defeated the 10 Tails. Then someone (Minato, Kushina, 9 or 8 Tails, Bee, etc.) will tell Naruto that to become the Sage of Six Paths, you need Senju and Uchiha cells. They'll tell him that he already has Senju cells because of his ancestry but not Uchiha cells so there's no hope. Then, boom, it'll hit Naruto he has Shisui's eye that Itachi gave him. Then he'll do something to absorb the cells (transplant the eye, absorb the eye in BM Mode, etc.) and then he'll go through some powerful transformation once again and have powers of the Sage of Six Paths. He'll seal away the 10 Tails forever, beat Madara, and either turn Obito good or kill him too. Then he'll fight Sasuke and either turn him good, kill him, die with Sasuke. Boom, end of Naruto....or at least Shippuden.