At least, since they're closing access from alternative sources, they're slowly succeeding in driving me off facebook. At least if I now have to move to an app, I'll pick one that supports end-to-end encryption (which facebook+xmpp+otr did fine, btw, until they killed it).
I wonder how quickly things will turn in the coming decades, as the incumbent network silos continue to screw users on the altar of data mining and ad revenue, and anyone can start a competing product for free (up to ~thousands of users at least, and at that point, maybe you can find a monetization strategy or get investment to keep going until your product becomes another "big thing").
As far as I can gather, XMPP is pretty much a dead end at this point, Google Wave is open, but also dead as a spec. So what'll presumably happen, is that eventually someone will find a new, sane, extensible and open protocol, and it will take over. We now know some things that other protocols were missing: easy serialization, sane hypermedia, sane extensions, sane push, sane presence, sane async and sync modes (mail and im w/server side archiving) end to end encryption, and some form of trust or other way to mitigate spam. I'm guessing it'll be json based with perhaps swappable transport. Probably should be encapsulated in message-level authenticated encryption. And it'll probably be another five years before we see it realized.