The zombie fad preservers because, more than anything, it's SHTF drama; how to survive in a world where all the comforts of modernity are gone and the social rules that held a modern, industrialized civilization together no longer apply. In The Walking Dead the zombies have become a nuisance. The real enemies are other human survivors.
“The real enemies are other human survivors.”
I expect that is about how it would turn out.
Well, except for this season, but yeah.