There's no doubt that the physical media side of Netflix is small by this stage. There were 14 million disc subscribers in 2011, but that fell to a mere 2.4 million by the second quarter of this year -- for context, there are 151 million streaming customers. It is, however, still a money maker. Although the $46 million in quarterly profits is a pittance in 2019 (Netflix has spent more on developing individual shows), that's clearly enough to keep it around.

We wouldn't count on another billion. Even if all existing disc subscribers rented a title every month from here on out, it would take nearly 35 years to hit the 6 billion mark. Not that Netflix or its customers are likely to complain. It's at least one more hurrah for the service that got Netflix started, and it serves as a reminder that streaming doesn't quite satisfy everyone.