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Bran wargs into Jaime in two time periods and murders Aerys and Cersei simultaneously!
I think Bran has to play some sort of big role in the upcoming episodes, otherwise his entire story was just a plot device to have the army of the dead get south of the wall, which in turn wasn't even the biggest conflict in the show. I felt the same way during the Battle of Winterfell when Bran just kind of reboots for a while instead of having some foreseen brilliance that helps turn the tide of the battle... he gave Arya a dagger but she was already loading up on weapons that could have done the job without him. Anyway, someone's probably thought out something similar before, but if Jamie gets to the throne room I hope Bran's involvement goes something like this:
Jamie arrives at King's Landing and attempts to gain Cersei's trust to get inside the city walls. Cersei eventually gives in as she is still carrying his child and might even feel guilty for bedding the pirate while Jamie was away and taking that finger in the bum... any time they've been apart for more than two episodes they always make up somehow so I don't think that would change here. Once inside the throne room, Jamie tries to plead with her to not go through with the battle as it will surly kill most of the citizens in the city and she pulls some "this is for us and our family" speech. Jamie kind of gives up on trying to convince her otherwise and watches the ongoing battle overlooking King's Landing, still torn on what to do.
Meanwhile Bran, knowing of Jamie and Cersei's history and knowing that they would inevitably meet in King's Landing, uses this opportunity to warg into Jamie and see through his eyes into the past. Jamie feels that something is wrong but still seems in control of his body and continues to watch the chaos of battle unfold around him, Targaryens still fighting Lannisters... but now they are on opposite sides of attack. He slowly begins to realize that he's no longer witnessing the Battle for the Seven Kingdoms, but instead it's the Sack of King's Landing twenty years prior. He returns to the throne room in a surreal daze and finds the Mad King standing at the foot of the throne, furious at Tywin Lannister's recent betrayal, yelling for his alchemists to "Burn them! Burn them all!" with the stockpiled wildfire underneath the city. Jamie finds himself suddenly standing at the throne, realizes the sword weighing heavy in his hand, then lifts and buries the blade into the Mad King's back. That instant he feels the haze leave his mind and can see clearly, looking around the room sensing that there is something different... he then slowly looks down and sees Cersei at the end of his blade, blood pooling around her as her last words, "burn them all", leave her. He stumbles backward, confused and frightened, onto the Iron Throne and realizes what he's done. All the bad things he's done in his life, all done in the name of his love for Cersei, are for nothing now... After fighting his way through the city, Jon finds Jamie sitting on the throne, just as Ned did all those years before, this time having slit his own throat.
Cut-scene to Bran, having just used Jamie to save King's Landing, defeat Cersei, and justify his purpose in the show, looking back through time at various family-member wedding nights and old craftsmen catalogs.