Is Tom Rothman in a round about way, the primary reason why Fox ultimately sold out to Disney?
https://www.youtube.com/watch?v=sP0A-NntFU4
When Tom Rothman was running the studio, it became notorious for making established franchises into movies and rewriting/ruining them. They've also become hated among movie buffs for what they perceive to be monumental levels of Executive Meddling and a focus on profit over creativity, with Fox studio executives having more control over a film's production than the director does.
https://tvtropes.org/pmwiki/pmwiki.php/ExecutiveMeddling/Film
https://tvtropes.org/pmwiki/pmwiki.php/DorkAge/Filmshare
The more notorious second one lasted from 2000-2012, when the aforementioned Tom Rothman was promoted to the studio.* Under his tenure, Rothman made a number of questionable decisions to certain movies, notably screwing the theatrical runs of Fantastic Mr. Fox, 127 Hours and Borat despite high critical praise, taking many films away from their directors and making a number of inexplicable changes to fit to his liking (he especially gained notoriety for this among X-Men and Fantastic Four fans, who blame him for the reviled X-Men: The Last Stand, X-Men Origins: Wolverine, particularly the latter's In Name Only version of Deadpool and the two Fantastic Four movies, though the latter two have garnered a more positive reception over the years, following the release of a more reviled Fantastic Four film in 2015, which he had greenlit in 2009). Movies like Alien vs. Predator, Babylon A.D., Dragonball Evolution, Kingdom of Heaven and Daredevil all fell victim to Rothman's wrath as well. He eventually resigned in September 2012, allegedly because of a spat with News Corporation executives over his tenure (the studio placed ninth in box office gross that year), and would join Sony Pictures the following year (setting the stage for their second Dork Age, as mentioned above). That said, there were a few bright spots for Fox under his rule, in particular overseeing the launch of their critically-acclaimed Fox Searchlight unit (albeit under Mechanic's tenure) and the critical and commercial success of Avatar, and he attempted to repair the damage he caused to the X-Men film franchise by green-lighting X-Men: First Class and The Wolverine. He also did call it right in some cases: he was against the studio's distribution agreement with DreamWorks Animation in the final months of his tenure (Fox had already owned Blue Sky Studios and had found success with their Ice Age franchise), which just so happened to coincide with that studio's second Dork Age as mentioned above. Unfortunately, Fox never fully recovered from Rothman's shadow despite having moderate successes after that such as Deadpool (2016), The Maze Runner Series, Logan, Dawn of the Planet of the Apes (along with its sequel), The Peanuts Movie, and The Martian, and just five years after Rothman's departure its parent company announced the sale of its entertainment properties, Fox included, to Disney.
https://tvtropes.org/pmwiki/pmwiki.php/NeverLiveItDown/LiveActionFilms
20th Century Fox was ultimately killed as an independently-operating major studio by ther stigma attracted by at least a couple of high-profile bad decisions regarding its Marvel properties, especially under former studio chairman Tom Rothman (who is currently the head of Sony Pictures' film division):
https://tvtropes.org/pmwiki/pmwiki.php/TroubledProduction/Film0ToL
Though the effects of the film's failure towards Fox are often inflated, it did influence Fox owner Rupert Murdoch's decision to sell much of his entertainment empire, including Fox, to rival Disney several years after the film's release, ending the studio's eight-decade-long tenure as one of the Hollywood majors and resulting in comparisons to this film and Heaven's Gate, and Josh Trank being seen as The New '10s' equivalent of Michael Cimino.