NBC is usually the lowest rated of all the the big three or four networks. I don’t watch it at all. But of people I know who watch, only the show Blacklist and sports, particularly NFL Football, are all that is watched. Maybe a few golfers and sports car enthusiasts need to stop, but it’s not football season yet so I doubt they will notice people are not watching. They already don’t watch.
NBCUniversal owns a dozen or more other cable channels too, not just the NBC branded ones.