He is dead
If there is a next arc then it might be about the sage's life and about his two sons. Something like that it it could be how when naruto and Sasuke are all old and they have their families and sht.
i could believe it....im actually hoping its true from what itachi said in the fight with nagato when he broke free from kabutos Edo
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im not saying hes alive and well but it could be a plausibility with all the curve balls we've been thrown but he could have just killed him self for the sake of the village