I think that says more about Facebook than it does about Uber. Not to derail the conversation but it's entirely possible that FB will be gone in ten years. They already have a demographic problem: far lower penetration among younger cohorts than in years past. And engagement metrics among new younger users show that they are using FB differently than older cohorts.

Thus, I think one could easily argue that FB could be supplanted very quickly by a new service that offers many of its features but is more attuned to the use cases of the younger generation. In Uber's case, the situation is much different because their only appeal (low fares) is unsustainable.