Facebook won't go anywhere for a while. It will just continue to reinvent itself. Coming soon, I see Facebook being mostly videos and live feed, kind of like Twitter's Periscope. Now, that said, there will be a lot of people that choose to leave Facebook, and not come back, for personal reasons. To those people, they don't care if Facebook lives or not. For Facebook being a "teetering" service, all you ever hear anymore is how someone saw something on Facebook, or someone asks if you saw something on there. In this day in age, people who do not have Facebook are considered outcasts or rare. I have a cousin that left Facebook 2 weeks ago, and said he has seen the quality of his life improve. He doesn't miss being in his phone all of the time, and he lives for moments now, instead of trying to take photos to tag people in. I see the threat of this happening more, before Facebook fails. More people will get fatigued and just leave.