"NBC Bet $69 Million on Megyn Kelly—Then Viewers Vanished"

WSJ:

The combined salaries of previous hosts Al Roker and Tamron Hall were less than half of Ms. Kelly’s $23 million-a-year payday, according to several people familiar with the matter.

...

When Diane Sawyer stepped down from anchoring ABC’s “World News Tonight” in 2014, relative unknown David Muir was given the job and ratings actually went up. After Katie Couric gave up anchoring “CBS Evening News,” she was replaced by the less-known Scott Pelley, who has subsequently been replaced by the even lesser-known Jeff Glor without a hit to ratings.