Hmmm, have you noticed that out of the Bijuus, there was also a Rabbit?! After spitting Madara out Kishi didn't exactly show it but what if, dunno, that rabit thing is a plot twist of some kind?
I am sure things are not ending here and imo, there's a part 3 where they will ultimately fight a revived Kaguya, this time maybe more powerful dunno... she didn't went out the exact same way Kishi kills off his characters and given how Madara appeared now when we thought he was dead, I'm very sure this isn't the end... It's like... their happy ending ain't gonna happen just yet.
I do have to agree with many have said. Believe it or not, it isn't like Kishi to have this amount of happiness in the ending. Even with Pain, it was only happy for Konoha to be saved, but the whole lost of Jiraiya still stings as some part cannot be undone. I was waiting for Naruto to do a Flash Gordon ending. You know, jump to the camera angle and go "YEAH!!!" Anyway, I guess we should wait on what's the next step.