Not even close? I mean you may be on to something with your hypothesis about the current wave of social media companies, but not if you step back and look at the bigger pictures. People are always looking at ways to connect. The whole premise of social media through the lens of the consumer is to find and stay in contact with ones people - either meatspace friends or newly discovered ones online. So will FB age out? Yes probably at some point. Is Instagram too photo/video centric and lacks any substance? Absolutely. Twitter is the best overall current source for news and information (amazing!) but it's format is both its strength and weakness. The TL DR version of this is - sooner or later some next wave will come along because the core purpose is too central to humans.