The story of how Facebook's empire began to unravel has been well documented in publications like Wired and the Atlantic, and the speculation continues regarding the ultimate impact on Facebook's viability if any significant number of users began to latch on to the #DeleteFacebook movement. In the world of tech, social media, and innovation, there is always another app or site or platform looking to capture the world's narcissistic but fleeting attention span, though few have been able to harness those forces as well as Mark Zuckerberg and his techies. That said, nothing is forever, and Facebook could certainly go the way of MySpace if he loses the Millenials and iGen. They already prefer other platforms like SnapChat (and Instagram, which is owned by Facebook).
If I were a techie - and I'm not - I'd be thinking about how to write the app and the platform that would allow Facebook users to migrate their photos and memories and friends to a new site that (at least on the surface) appears to provide better protection of privacy and data while still offering the comfort and ease that Facebook does. Of course, it will take some research into how Zuck pulled off his act of (social media-) world domination. While someone writes the code, the young entrepreneur should consider checking out some books like: