It doesn't take much for a "darling" social media or dotcom company to become a thing of the past. If my memory serves me correctly, before Google, there was AltaVista https://en.wikipedia.org/wiki/AltaVista . Before Facebook, there was MySpace https://en.wikipedia.org/wiki/Myspace . Yahoo is on it's way out especially after the data breach https://money.cnn.com/2017/10/03/technology/business/yahoo-b...
Facebook is NOT the only social media company around and some other company WILL emerge and fill its place in the ecosystem if they don't recover from their mistakes.
What is interesting to me is that previously each turn-over has been at a much smaller scale. The internet has grown so much and become so much more ubiquitous since AltaVista and MySpace, that seeing a social media giant begin to "turn over" today is rather spectacular and awe inspiring.