I believe that Madara is going to disapear but one thing that nobody seems to have noticed is that this means that the five Kages lost the fight. Think about it, they went on and on about how they would take care of Madara and they were creamed. I think that they survive but their spirits are broken. In order to be Hokage you have to be able to lead, so I suspect Naruto is going to have to really step up soon. Also I doubt that were in the final fights of the series there are to many unanswered questions and to much set up for more.
For example, the cave were Kabuto learned Sage mode and the third type of Sage Mode has yet to be revealed. Plus there is that jutsu Naruto's father left him in the key to the seal which has yet to be revealed. And I highly doubt that awakening the Rinnegan and Perfect Susanoo is as easy as a couple of fights, you probably have to do something drastic. And Tobi knows how to perform Impure World Resurection but not how to end it because Kabuto lied, but Sasuke does, I smell a set up for more stories. Plus I highly doubt that Naruto has reached his peak yet I suspect Naruto will learn a few new tricks before this series is over. So I say we have at least another year of chapters to go.