The question is, will Rick's death be a catalyst for unity or explode it all into utter chaos?
Both; some will see they were wrong to fight against Rick's pledge to Carl and "the new world", while others will see Rick's departure as the final nail in humanity's coffin. For any of the characters who knew Rick since or near the beginning, his loss will be the culmination of all of the suffering and fighting with nothing gained for it all, which might send them into a state of extreme isolation and violent, opportunistic behavior, similar to the Wolves of Randall's gang (season 2).
And what role will Negan play? They're not keeping Jeffrey Dean Morgan on the payroll to just stand in the shadows and beat his head against the wall.
I'm guessing he's going to escape, or by some incredible change of heart, Michonne grants him "time in the yard" (a prison reference), hinting at Carl's dream of Negan walking around, talking to Judith, etc., but he will ultimately be the beast he's always been and seek help from ex-Saviors, or the Whisperers to drop the final hand of destruction on his enemies, which is the point he leaves the show, as I don't see him continuing to play well (as a hard A-type dictator personality) with the leader(s) of that group.
At the moment, I'm operating under the belief that A means potential threat, as that would explain why Gabriel's sudden reclassification nearly gets him killed. Mind you, the part I don't get is whoever Jadis was talking to said they wanted an A, and upon realizing Gabriel is one, she tries to kill him.
If Father Gabriel is classified as "A", then Jadis probably figured she did not want him to face whatever happens to "A" class people once they're in the hands of her benefactors (honestly caring about him?), and could not spare his life for fear that he would act on his promise to tell Rick and Company about her secret business.
Personally, I'm kind of annoyed we're likely not getting a proper good-bye between Rick and Morgan.
Well,
Fear the Walking Dead was an experiment on fumes and needed a boost. Since Morgan has brought some attention back the series, and the character now wants to plant himself with others to make a new community, there's not much of a chance he will show up on TWD...
...unless FTWD ultimately faces cancellation, so the showrunners create some doomsday plot to kill off everyone except for one or two characters who join Morgan on his once-abandoned trip back to Virginia, right in time for some important TWD plot to start.