I have a theori about the upcoming volume, Something To Fear.
I think that all the Alexandria-dudes will go and figth The Saviors. Maybe Rick and Carl dies? Could be a nice twist. Replacing Glenn, Abraham, Michonne or someone else for the maincharacter-role.
But anyways. I really think (and hope) that Heath and Aaron will survive the volume. I have a small thought that Heath will survive the whole series. It could be nice if he and Glenn survived all way. Mostly because they are ordinary guys, like everyone else in real life.
And i think that Eric will die to cause Aaron to be sad and don't want to live.