As we all know Kishi will do things that some of us like and others hate
how do we know he wont do a btw juubi is not the only juubi in fact there are other worlds out there in each world
there is a juubi. Why who knows maybe a god or a civ in 1 of these many worlds designed juubi for a just in case scenario where when humanity gets out of line juubi will be there
or the fate of humanity is in their hands when they have peace the juubi is at peace when they have war the juubi is at rage mode. 1st time
we hear about the juubi humanity is in an Era of chaos death war and pain. Now for all we know its to teach them a lesson but there would be a limit if humanity cant keep the peace then juubi would eventually go into the Destroy all life mode since humans failed to be at peace.
When we 1st hear about juubi its depicted as a monster or Demon god during the age of Endless War ??? is why was it there did it cause the war or was juubi carrying out its duty until the sage came along who knows???
Then we all assume if juubi is comes back the 9 bijuu will all rememeber naruto and the juubi will be in peace mode
or in fact it will gain full consciousness.
I wouldn't be suprised if he did the whole we won thing but suddenly portal opens random being explains to them why juubi is u know the whole shabaam but then the being is like despite your efforts this world too needs to be restored
like all the others you have failed then he opens the portal behind him and Naruto and co all see legions of Juubi's coming towards them being is like peace must be restored with your deaths. FIN
What i find really amusing is that i can only come up with crazy ideas when im bored