When World War Z came out in 2013, it was immediately hailed as a promising start to a brand-new zombie franchise, but that never materialized. Horror is a genre that often finds itself falling into familiar patterns. Throughout the 1980s and 1990s, slasher horrors, and horror comedies had a hay day. At other points, sub-genres like body, psychological, supernatural and more all had moments where they became the most popular and prominent categories. However, the zombie sub-genre has been largely quiet for decades, with just a handful of decent movies featuring the walking dead.

https://screenrant.com/world-war-z-2-movie-no-sequel-upset-brad-pitt/