I just read a Kishimoto interview that says Naruto is going to end sometime around July-August 2014. That's 24-28 chapters, and the rate Kishi's been going, that's not a lot. Considering he's been doing everything in his power to drag this war out as much as possible.
If that's really Kishi's plan, Madara's defeat is going to be the asspulls of all asspulls. It'll be an asspull that will make proctologists the world over cringe over how deep he will have to dig to reach it. Books will be written on how to write a story, and this asspull will be used by all of them as an example of how not to do it! The shittiest writers in the world gathered long ago and foretold of this occasion.
Not to mention, a Naruto/Sasuke fight is going to be crammed into all this as well. Be scared people.
One Piece! Hell Yeah!