There are several ways Naruto may end:-
1. Naruto some how manages to kill Madara? (I seriously doubt it)
2. Naruto some how extracts all the bijjus to become jubbi's host?
3. Naruto changes Madara's thinking (like he did with Obito), and madara extracts all the bijjus and creates the same system as the SO6P did?
4. Naruto and sasuke fuse their bodies and abilities to make a perfectly same body as that of SO6P...and then defeat madara?
1. Naruto some how manages to kill Madara? (I seriously doubt it)
2. Naruto some how extracts all the bijjus to become jubbi's host?
3. Naruto changes Madara's thinking (like he did with Obito), and madara extracts all the bijjus and creates the same system as the SO6P did?
4. Naruto and sasuke fuse their bodies and abilities to make a perfectly same body as that of SO6P...and then defeat madara?