Just a small prediction I have. I was thinking about what can possibly take out the juubi and then it hit me, sasuke's susanoo can. It's big enough and strong enough to do it (then maybe we can see a susanoo showdown between sasuke and madara). However I don't know how this will fit into the bigger scale of things because I believe that naruto and sasuke will fight each other in the end of the day. They have to, that's what he series has been leading up to the entire time