It turns out that Donald Glover's animated Deadpool series was mainly scrapped by Wade Wilson's parent company, Marvel. This was revealed by FX CEO John Landgraf, who spoke to Variety about his network and its various programs at this year's Television Critics Association press tour.
"They didn’t want to do the show that Donald and Stephen [Glover] wrote," he said. "We would have done the show that Donald and Stephen wrote, but it wasn’t our decision. When Marvel decided not to do that show, we parted company with them, as did Donald and Stephen. Now it’s totally up to them [Marvel] whether they hire someone else to do a different show."
Since Marvel does own the property, they are allowed to call a good deal (if not all) of the creative shots, and at the end of the day they must not have been in wholehearted agreement with Glover and his brother Stephen's overall vision for the series. FX even announced back in March that the project would not move forward due to "creative differences" among FX, the Glover siblings, and Marvel Television.
Nevertheless, Landgraf doesn't think the project is particularly dead and feels that it'll receive some sort of second life.
"I think that Marvel will revive it, because they have the rights," he said. "They own the IP, and they have the rights to do an animated adult series based on any of the X-Men characters, and based on Deadpool specifically."
Ordered by the network last spring, the series was going to be, according to one of its writers, in the style of Adult Swim's Rick and Morty. Shortly after the announcement of the cancellation, Glover tweeted out a spoof script with the message "for the record: i wasnt too busy to work on deadpool," for those who believed his scheduled was so packed with work on Atlanta, Solo, and The Lion King remake.
Deadpool co-creator Rob Liefeld praised the script, which focused on the titular mercenary protecting an endangered rhino, as "brilliant." Titmouse also released a demo reel of the animation that would be utilized for the show. Sadly, the footage has since been removed from the studio's Vimeo page.
In the end, thankfully, no bridges were burned. Glover still has a working relationship with FX for his hit show Atlanta, while FX has a continuing partnership with Marvel over Legion, which was recently renewed for a third season.