if the series continues after this new story arc and the group wanders aimlessly in the wild for a period of time before encountering another group, i think it should be a death cult. this post-apocalyptic world is like the dark ages with no technology or progress. i imagine it wouldn't take long for people to descend into superstition and mysticism. even before the destruction of civilization, people were joining various cults (jim jones, david koresh, ISIS, etc..) enough of these suburban utopias. with the dead roaming the earth, a lot of people would toss rationality out of the window and seek spiritual solutions. i could see a primitive, mayan-like culture forming, which makes human sacrifices to their tribal gods in order to seek protection from the damned. that's where i'd like to see next season go.