According to an article in Bloomberg News, Prime Time television viewership of the 2016 Olympics was down about 17% compared to the 2012 Olympics. The decline for 18-49 year-olds was down 25%.
Even though NBC charged about 50% more for advertising on their streaming Internet content, revenue was still down significantly from four years ago.
The bad news for advertisers is that their commercials were seen by far fewer people than was promised. The even worse news for NBC may be that they have spent a lot of money to get broadcast rights for the Olympics through 2032. Both advertisers and NBC are left with the question of what to do next.