That, and the $13 million paid out for "founded" claims...and the revolt of the advertisers which has threatened to spread to other shows...and the fact that you don't have anyone in the building willing to go to bat for you.
As an aside, Greta wrote that when Ailes was fired last year that left a clause in their contracts that they could get out of the contract. She took advantage of that clause.
How do you know that?
Some at Fox News were crying he was fired:
http://www.vanityfair.com/news/2017/04/bill-oreillys-ouster-fox-executives-fear-theres-more-to-come
reactions to the news of OReillys departure were decidedly mixed in the newsroom. Some staffers cried.