You know what mate, fk these cocky kids, good theory. Kishi likes doing shit like this. Highly possible, that said nothing will beat pains defeat!!! Sage mode ran out shadow clones used for last defence to get a rasengan in, BOOOYA
I belive now that the final villain of this story is the juubi.
The juubi hasn't been defeated in the normal sense only sealed.
There will come a point where madara and obito will pay for reviving the juubi and it will be up to the shinobi world to finah the so6p work once and for all With naruto heading the charge.
Because at the end of the day this whole series is about why naruto can succeed in uniting the world over the so6p.