If you want to know why: It's because I personally believe the future of social networks is to niche, with disparate social networks connected via a Distributed Social Networking Protocol. Your social network account will be more like your email account. I think Facebook will find itself on the wrong side of history when that battle starts by trying to lock down it's data and lock people into Facebook.
That's just my belief and I'm open to the possibility that it could be completely wrong, so don't go crazy with the down votes.
But if we're just talking about the next 12 to 24 months, then, oh yes, of course he will.