My prediction? The war isn't the last battle in the series, it will be the most devastating but there will be a more intimate final battle afterwards. Sasuske and Kabuto survive - Kabuto / Orochimaru is the final villain, perhaps controlling a reanimated Madara puppet.
Sasuke, joining his friends for a last time, delivers the final death blow to Kabuto while sustaining a fatal injury himself. Naruto and Sakura hover over his body, tears flow, some emotional stuff, and then Naruto is the Hokage. Kishimoto sleeps for a month straight.
There's no way Sasuke is alive at the end of this series - not happenin. I'd put my money on both Naruto and Sasuke dying before I'd put it on Sasuke living.