I've had a thought concerning the Lannisters.
Martin likes to use character actions and emotions as recurring themes. Past events foreshadow future events. For example, Ned promised Lyanna something on her deathbed and that promise cost him a lot... then Ned promised Robert something on his deathbed and it cost him everything. Another example is the way Tyrion gave his love to Tysha, a girl far below him, when he knew he should not do it and he and his father betrayed her... then Tyrion gave his love to Shae, a woman far below him, and she and his father betrayed him.
The thought about Jaime is this...
Jaime is the Kingslayer. He commited regicide to save tens of thousands of people from Aery's murderous insanity. He has commited heinous acts of incest and the attempted murder of a child, but he is trying to find redemption.
Tyrion was found guilty of murdering Joffrey (sharing his brother's title of Kingslayer) and then killed their father and earning himself the title Kinslayer. As Tyrion followed Jaime, will Jaime now follow Tyrion?
Cersei has developed some paranoia. She is now torturing her enemies. She kidnaps those who threaten her. She puts out bounties, both public and private, on those she hates. She is sounding more and more like Aerys II.
Is all this foreshadowing that Jaime will again kill the King? Is this foreshadowing that Jaime will kill his kin?
Will Cersei threaten to blow up King's Landing? She's already burnt the Tower of the Hand.
Will Jaime be forced to kill Cersei to protect innocent people?
Martin likes to hide the truth in plain sight, sort of like Shyamalan in The Sixth Sense.