Is it time for him to make the ultimate sacrifice and complete his redemption arc by dying for his queen? That's felt like his higher purpose since he was introduced way back in Season 1. While some characters are schemers and game-players, Jorah is a warrior looking to regain his honor. It wouldn't make sense for him to survive countless battles, beat a deadly disease, and then live out the rest of his life as an advisor to Dany. Along with Cersei, he's one of the few remaining characters who simply must die.
It's worth remembering the aforementioned scene between Jorah and Barristan Selmy from Season 3. "Just once in my life before it's over, I want to know what it's like to serve with pride and fight for someone I believe in," says Barristan, before Jorah assures him that Dany is that type of leader. Of course, a couple seasons later Barristan got his chance: he dies defending Daenerys. Even if he survives the fight with the White Walkers next week, all signs point to Jorah suffering a similarly brutal fate.