Fantastic post.
I believe Cersei is a goner, probably by Jamies hand, but I must admit I have no clue how.
I thought that Jamie would be completely pissed at the because of last seasons finale when she blow up the Sept using wildfire.
Jamie killed the Mad King because of his plans with wildfire and suffered being called kingslayer all his life. But he does seem completely in love with her.
I can't image Tryion killing her.

I also predict many deaths beyond the wall this season - Tormund, Beric, the Hound...