I think Facebook is repeating MySpace's mistake - its signal-to-noise ratio is diminishing. Unfortunately, Google has lost patience with Google+. All Google needs to do is keep observing Facebook, address its shortcomings, and have a little more patience!
Got to about the point where the author tried to say that facebook could be replaced instantly without causing any waves... Sorry, no, it can't. Basically this article is full of hot air and not much else.
If the Facebook OAuth module is closed, if their comments module is closed, or if their advertising platform is closed overnight sure there will be waves.
But the part you mention actually refers to the easiness to close a Facebook account and switch to WeChat, or Viber. This part talks about the user base, which is at the end of the day the foundation of their business model.
The point made here is that there's no real lockin because there's no real value.
A speculation will remain a speculation my friend, no need to try to make it look scientific. I think the point is correctly argumented, then you might agree with the arguments or not.
