Naruto will not solo Obito
I see a lot of bullshit theories rising on Juubi Naruto and Rinnegan Naruto and other BS, I think people are failing to see the purpose of the current scenario and what it's referrencing.
Aside that there's no chance of Naruto getting Rinnegan, he doesn't have the Juubi chakra either. He's the Kyuubi Jin and that's what he's meant to be, it took him the entire series to befriend Kurama and that ain't gonna go to hell at this point in the manga.
But anyway, that's not the point. There won't be a Obito vs Naruto 1v1 final fight. The ideal Naruto is fighting for is that union makes strenght, that the world can team up and fight together, whereas Obito believes in the opposite. Itachi has already highlighted this:
There is a purpose to the Shinobi alliance and the final fight will be the entire world vs Obito. Because yeah, Obito really can solo everything and everyone right now, Naruto would lose in seconds alone.
And don't forget that manga counts for art, and artworks always have a referrence. Kishimoto is a Dragonball fan, and the end of Naruto reflects the end of DBZ in which everyone had to become friends and cooperate in order to defeat Majin Buu. Goku could not have won alone.
From a plot point of view, Juubi Naruto makes no sense at all, it would kill everything Kishimoto has been building up thus far.