not really, everyones in the facebook.
No, he's correct. A couple months ago Facebook itself acknowledged that a huge % of it's "active users" were accounts set up for babies, pets, ficticious entitites, and bots. Lots and lots of bots. So that's not really one billion, or even close to it. Not that I'm trying to take anything away from Facebook or anything.
I would love if absolutely everyone in the world could be/was on Facebook. I really do hope it becomes more successful in that way, that more people start to "get" it, and that more people start to take advantage of the great features of Timeline and Open Graph, to fill out their profiles with their lives.
As you can tell, I'm quite passionately for what Facebook are doing and the direction they're going in
I doubt it'll happen. For awhile there it seemed likely but now we're at a point where more and more people are leaving Facebook or outright dislike it. I have nothing against it, my gripe is with stupid people that don't use it properly and protect themselves. Facebook has ceased being useful for me and now just serves as a place where people I don't care enough about pile up in a convenient list. Whatever replaces Facebook has the potential to do what you're looking for, but I think within the next 5~ years or so Facebook will go the way of MySpace. There was a point there where every time I met a new person they'd mention Facebook, recently though nobody has asked. Much like what happened with MySpace.