Fair point, but both those shows initially found popularity before the streaming era. Is NBC still capable of producing content that people will binge-watch 10-20 years later for a nostalgia kick?
SNL is still fairly popular, as are Brooklyn Nine-nine, Late Night, The Tonight Show, etc. And 30 Rock and Parks and Recreation wrapped up not that long ago.
They also do have a major ace up their sleeve as the official American broadcaster of the Olympics.