Disagree. People are still clamoring for such a game hence the crazy popularity of the day after. There has yet been a game that had done it better than dayz stand alone. Which took nearly a decade to actually get good. If a triple a studio actually did a zombie mmo right it would be hella popular. Shit if the day after devs could pivot their game to be what they said it would be people would come flocking back.
Its not a zombie mmo tho