Or Kishi could seriously troll us and this whole fight turns out to be Naruto's infinite tsukuyomi dream and the real fight is still yet to happen ¬_¬
Everything seemed a bit too 'sunshine and rainbows' for my liking.
But getting hit by the IT means your dreams come true. Naruto's dream is to become Hokage, not to seal Kaguya. And personally, I wouldn't mind if this is it. No more bigger baddie, as Kaguya was already the highest you can go. No more Hagoromo "Psyche, BI+CHES!" trick and turning out to be the final FINAL enemy, or having Orochimaru quickly awaken from IT, steal Madara's body, and become the super mega ultra enemy that everyone will have to fight once and for all. Just have everyone free from IT, have all the past Kages talk with the current Kages and negotiate to make the Shinobi world finally unified, have the dead go with Hagoromo to Ninja Heaven, obligatory Naruto vs Sasuke, and that's it.
BTW, do Hiruzen and Minato finally get to go to Ninja Heaven? They were freed from RDS, so they're not trapped souls anymore.
^not going to quote all that though
She's stuck/sealed in that moon. She's trapped in the center of it, and all that pressure is preventing anything from getting out. She's STILL not dead, just sealed. So in the FAAAAAAAAAAAR future, when some diabolical maniac stumbles upon it, and somehow manages to destroy it, Kaguya will be revived once more.
She could have avoided getting hit by the trio, but it seems she was already running low on Chakra.
Hagoromo and his brother did the sealing way back then. Seeing as how they are separated, he couldn't have done anything. So he waited until the right time until he met two men who are descendants of Ashura and Indra were fighting for a single threat to save the Shinobi world. Also, isn't he technically dead? He's just a spirit doing spirit stuff now. It doesn't look like he can fight anymore.