Any network knows shows and people have a shelf life. They made a financial decision. Greta Van Susteren has been on CNN, Fox, MSNBC, and NBC. Glenn Beck has been on CNN, Fox, and his own network. Imus has been ... everywhere. He's about 111 years old, and has been fired everywhere, but is still working. Why? Because he still draws viewers, after each crisis dies down. O'Reilly won't be looking long.