One of Orochimaru, Madara or Hagoromo better do something next chapter. I don't care which tbh, any of them would be a way better final villain than Kaguya.
I've been thinking on the lines of something similar. Orochimaru has to be up to something, knowing him. He still wants an Uchiha, maybe Madara.It has not ended yet. I think hagoromo will somehow undo the genjutsu. Then orochimaru will immediately take over madara's body becoming the next vilian. Naru and sasu will fight him, defeat him. But just 2 make sure he's gone, he'll have to be sealed. Sasuke will den decide to seal oro inside himself only to become possesed by the evil in oro which also activates rinnigan in his right eye thereby becoming d final vilian. Then hagoromo will sumhow infuse d bijuus in naruto leavin naruto with the responsibility of settling things. Minato gives naruto the death god seal, edo tensei undo's then its ends with a "Naruto vs Sasuke". Naruto defeats him and extracts oro frm him and seals him with d death god. And sumhw survives it. Finish. Dats wat i made up anyway.
I'd like it if Madara attempted to do something himself but I think he'd be pretty hopeless against Naruto, Sasuke and Hagoromo. Orochimaru suddenly striking would be good too because his complete 180 change to good guy was so out of the blue and just does not suit him at all. He is a major villain first and foremost.I've been thinking on the lines of something similar. Orochimaru has to be up to something, knowing him. He still wants an Uchiha, maybe Madara.
Sasuke is the final fight Naruto has to face, Kishi pretty much already said this. So things aren't going to be straight forward from here.