That's why Zuck has been very aggressive with acquisitions, to future proof the company. He's bought two of his biggest competitors, Instagram and Whatsapp, and Oculus which could be the future. I'm pretty pleased with his corporate foresight.
Yes and Internet users are very fickle. In particular, users used to a free product evaporate when charges arise. The endless struggle to stay relevant kills them.
For examples see MySpace, Friendster, Bebo, Twitter....
