And no, I don't mean something completely impossible like Naruto-Sasuke sex or some hater talk like, "they cancel it." This one is for the fans. If you could have your way and make something at least moderately plausible happen, what would you want?
For me, the #1 would be Orochimaru brought back as an Edo Zombie with a pair of sharingan eyes similar to how the Jinchus got brought back with a rinnegan and sharingan. He always wanted them and I'd like to see what he could do with them. He always got Rodney Dangerfield'ed and played like a chump for almost all of Shippudden so it'd be nice to see him comeback powerful and not as an opponent who gets one hit ko'd with minimal effort by every Uchiha and their mom. ESPECIALLY since people like the Kages and even some of the chump level baddies guarding the Kages were able to put up a fight (or at least stay in the fight) against Sasuke and other Uchiha.