This theory might suck. But I think this Naruto anime/mang will end very good.
If this war keeps going on and if Sasuke vs Naruto or Naruto vs Mandara
Or Sasuke and Naruto vs Mandara happens. I believe truely it will be Naruto vs Kabuto-Oro at the end.
Oro is and was the main villian. With that being said while they get closer to the end of the war. I believe pain might be one of the last IWR.
He is dead already so I have a feeling before he go he is going to do a Hanzo and not listen and bring back the dead from even longer ago.
He could not do this before because he was alive and he would die even if he brought back the most recent. But because he is already dead he would bring back the dead from even longer ago.
This might weaken Kabuto too in the long run because we seen how all that charka takes to bring back the dead.
At the end Asuma might see his baby
Jman might return to smile with Naruto
Some of the Atuski might rewrite their paths for the good
Itachi and his clan might come back.
Sasuke well feel better
( I would say the 3rd but he is super uber old)
yea.... this theory would be nice