I cannot help but feel that, after reading 128 Negan will be freed by Magna after telling her lies about Rick and his people. Like he will say something along the lines of "Rick overthrew me because he wanted my power. He is a dictator that must be stopped!" and Magna will fall for it, and with Magna's help Negan will kill Rick. This will cause the safe zone to collapse unto itself and cause Carl to go over the deep end, hunting Magna and Negan, as he and her group escape from the alleged "villains".
Just a theory...but I cannot help but feel this is the route Kirkman is taking. Like a Star Wars episode 3 kinda thing, with the Jedi being replaced by the safe zone people.
Thoughts?

PS: Mods, if you want to spoiler this you can.