FB will have to change
Facebook has found itself with two audiences (older vs. gen y/millennials) who have conflicting desires and demands. If you're young and suddenly grandma and Uncle Phil are using the same social platform as you, you gotta get out, or at least post less and fill in the gaps with snapchat, instagram etc. Facebook will always keep it's core business (social networking) but will have to expand into new products to survive just as Microsoft, Amazon, Google and Apple have done. The road will get harder for FB in the next 10 years but it has the smarts to adapt and thrive.