Assuming, of course, that those left standing would be able to revert back to morally bound sustainability.
The fear of spontaneously getting attacked by the undead would eventually become outdated and passé, and people would once again gain the ability to thrive within nature.
Something tells me characters like Alpha and Beta would fail hard in that respect.
As well, that would completely change up the tone anytime a character was walking through the woods, or walking near an abandoned vehicle, or searching through a rickety old house.