World War Z's original ending, which was drastically different from the film's actual ending, could have saved the franchise's future. World War Z is loosely based on World War Z: An Oral History of the Zombie War by Max Brooks. World War Z, starring Brad Pitt, came out in 2013 and enjoyed a healthy level of success. A sequel was initially planned until Paramount canceled it in 2019 for several logistical reasons, but Brad Pitt still hopes to make the sequel happen one day.
https://screenrant.com/world-war-z-original-ending-saved-franchise/