If Jiraiya comes back, that will be like a huge middle finger to the Pain Arc. His death was laid out so perfectly. Jiraiya's story is over, then Nagato completed his story, now its up to Naruto to finish the trilogy.
Seriously, what would be the point in bringing Jiraiya back? Kabuto's gone, so he's not gonna use him for the war, Second Hokage has no intentions of bringing him back (or even knows him), and Orochimaru has the Hokages already. Jiraiya's got nothing left to say to Naruto, and his role in the story as Naruto's mentor is complete. The concept of Death would be diminished further than Dragon Ball Z, seeing as when someone dies, someone else gets revived at the end of the Arc.
I swear, people here just want to bring people back because YOLO (see what I did there?)