Sage mode is supposed to be the greatest self power in this manga. Kishi already showed us what the guy could do when he was fodder(shit on kyuubi); I'm at least expecting him to be somewhat useful against madara with it seeing as there'd be less chakra to absorb.
Kishi can do this right seeing as logically naruto should be a shit load better with SM seeing as the last time he used it in a real battle was after he just learnt it (not counting his one move on raikage)
But even with Sage Mode, this is Madara who also has Sage Mode along with Mokuton, EMS, Rinnegan, a century of experience, and who knows what else. And if he gets the Ten Tails he will be even more OP.
I think that Narutobase would collapse with the PNJ and ass pull complaints if SM Naruto and his friends were enough to bring down Madara.