I have read as much to suggest that Beck is making this move on his own initiative, as to suggest that he is being forced out. He already has planned new ventures, to include his own TV network. That tells me he is moving of his own free will after a long planning and preparation period. And Murdock surely wouldn’t want to give up the revenue that Beck brings in.
He is being forced out because he is hitting the enemy right between the eyes. Beck knew his time would end because of that. When he goes out on his own or does a few shows for FOX it will not have nearly the impact his 5pm spot had.
I applaud him for his bravery and the classy way he is leaving FOX.