Strawman. The article's writer can do better than view Facebook as a one trick pony. It is an internet behemoth. Instagram aside, there is so much media sharing on WhatsApp alone that it might blow away most of the other internet properties away. WhatsApp with VoIP now has the mobile network operators by their balls. No one is logging out of that, by far.
> Some empires fall because they’re invaded from the outside or rot from within. Zuckerberg’s could be the first in history to collapse simply because its citizens logged out.
Couldn't be further from the truth. People might get dis-interested in Facebook, over time... but existence of Facebook is more than folks just logging out.