For any technology, there is a point of inflection. That is the moment at which it transitions from a curiosity to a fundamental part of our everyday reality.
You can go back through history and identify the inflection point for various technologies. Some examples that come to mind are mass publishing, universal air conditioning, radio, cinema, television, the Web, SmartPhones and more.
Clearly every inflection point has a “before” and an “after”. Yet it may not always be obvious what is the decisive moment when everything flips.
I wonder whether there is a formal way of defining the inflection point for mass adoption of a technology.