Back at Star Wars Celebration Anaheim in 2015, Lucasfilm was set to reveal two Star Wars spin-offs. The first was obviously Rogue One, and the other was Boba Fett.
Fans remember at the time when Josh Trank was a no-show, citing a bad flu, and Lucasfilm even had an announcement trailer cut just like they did for Rogue One at the convention. Now we know why Josh Trank left the movie.
Now a big feature on Polygon about Trank and mostly about the 2015 Fantastic Four movie reveals what happened on Boba Fett:
“Whispers of the turmoil reached Disney and Kathleen Kennedy at Lucasfilm. No one had seen the cut of Fantastic Four that would arrive in theaters (including Trank), but the he-said-she-said dispute was enough to shake her confidence. Trank said he and Kennedy agreed that the director should sit out his scheduled appearance at the 2015 Star Wars Celebration in April, but even then, he couldn’t pick the conversation back up. “
Trank said, “I quit because I knew I was going to be fired if I didn’t quit.”
So it’s exactly what many people have suspected for the last five years. The drama surrounding the Fantastic Four reboot is what killed the Boba Fett movie.