Some analysts believe that James and Lachlan Murdoch - the sons of 21st Century Fox executive chairman Rupert Murdoch - made the call on O'Reilly to change the Ailesian culture at the network and to cement their control following his departure.
It is unclear if Fox News is paying O'Reilly.
The harassment complaints are on top of separate allegations against Roger Ailes, Fox News' co-founder.
"Somebody will offer him work, I have no doubt about it", he said.
But what matters more than ad sales is how O'Reilly's ousting will potentially impact affiliate fees, or the portion of cable and satellite subscription costs that gets paid to the specific network, DiClemente said.
Marc Kasowitz, O'Reilly's attorney, said that it was "outrageous that an allegation from an anonymous person about something that purportedly happened nearly a decade ago is being treated as fact, especially where there is obviously an orchestrated campaign by activists and lawyers to destroy Mr. O'Reilly and enrich themselves through publicity driven donations".
O'Reilly released a statement, calling it "tremendously disheartening that we part ways due to completely unfounded claims".More news: Australia scraps visa programme used largely by Indians, to introduce stricter rules
His show's viewership increased the week after the story appeared - O'Reilly did not address it on the air - and has sunk since he went on holiday. "Dear Murdochs, I'm not giving up until he's gone", she wrote.
In a statement, 21st Century Fox said, "After a thorough and careful review of the allegations, the Company and Bill O'Reilly have agreed that Bill O'Reilly will not be returning to the Fox News Channel".
The woman, who is not contemplating any legal action, reported being "very stressed and disillusioned" about her job and believed she would be fired if she complained to anyone, Bloom said.
(AP Photo/Mary Altaffer). A poster featuring Bill O'Reilly is displayed at the News Corp. headquarters in Midtown Manhattan, Wednesday, April 19, 2017. So-called "non-compete" clauses are common but not universal.
But many of O'Reilly's fans took to social media to express their unhappiness at losing their hero.
The channels that are trying to challenge Fox, like Newsmax, have much smaller profiles and are harder to find on the dial. "Those two things mean the end of the conservative Fox as we know it or have known it". But the channel recently earned some attention by hiring former Trump campaign manager Corey Lewandowski as a commentator.
Newsmax TV, Glenn Beck's The Blaze and Sinclair Broadcasting have also been mentioned as possible suitors for O'Reilly. And something tells me those advertisers might have returned once the dust settled. As a result, advertisers moved their spots out of his program, "The O'Reilly Factor", which has the highest ratings in cable news.