O’Reilly is on vacation. His audience generally goes down when he is not there. Megan Kelly actually pick up 200,000 viewers from O’Reilly’s numbers. A number of Kelly’s viewers are due to O’Reilly. Viewers staying with the channel after O’Reilly is over. You would have expected Hanity to lose a substantial amount of viewers, but I believe that Trump’s presence on his show helped Hanity’s gains.
Hannity used to lose about 1 million O’Riley viewers after following him - now, Megyn loses some but lately has gained some. She was on track to start to beat O’Riley but the current fiasco has yet to play out.
Kelly is generally good to and for conservatives - mistakes were made - time to back off and move forward.