Even if Facebook-the-product dies[0], Facebook-the-company will continue to be around for a looong time. Even if they fall out of public favor, they have enough money, enough data, enough business connections, etc. to continue for a very long time [1].
Honestly, if somehow enough people actually manage to get mad enough at Facebook for it to potentially affect their bottom line, they would likely use Zuckerberg as a scapegoat and ditch him. People like to latch onto a single individual as the problem, so that stunt would probably placate a lot of people [2].
[0]: Even this seems very unlikely given how many deep ties they have into peoples' lives. Keep in mind that it is far from just a social networking tool or blogging platform.
[1]: Hell, they probably have enough money and blackmail data to do whatever they want. Including blackmail.
[2]: Witch hunts are more popular than ever :)