From my experience about a decade ago, now, I would say that if there was any such possibility the "network" would be sending out an alarm.
CBS makes money off of TAR not just from advertisers in the most highly preferred demo but from international syndication, and they finally figured out they can used TVGN which CBS half-owns as well as I Tunes and Google as revenue streams. And the overnights are now so deceptive as to the actual audience that watches within the 30 days now being tracked by CBS Research internally, that worrying about the ratings has become ridiculous. (When we're still in the Top 25 in the weekly broadcast ratings, no matter what those overnights look like, it has become next to meaningless.)