The summary alludes to this, but Facebook has done a much better job integrating into society than MySpace ever did at it's peak. At best, MySpace was a good place to go see about a new band. Facebook has built alliances (either officially, or just by use) with almost every major brand, and every company in the western world. This kind of branding will be held on to by corporations big and small, as they know it's a good way to reach users.
What we could see happen is that users abandon the service to connect to real people, and only use it to connect to brands, because the brands are demanding it. Over time (several more years) the brands will likely deprioritize their presence on the network, because people don't engage with them the way they used to. Go watch a commercial break on TV right now, I bet that one of the ads uses facebook.com/brandname as their website address. How insane is that? Snickers uses facebook.com/snickers instead of Snickers.com! Why would you do this? Facebook limits the opportunities that brands have to engage, and yet brands have played right into it, because the network is so powerful.
I do believe Facebook will live on as a way to authenticate and connect with other websites. It's a useful way to verify someone's real name, their social connections, and that they are a "good actor." See: many dating websites.