Pretty sure the stock will spike in the short term and then go on an endless decline to 0 if they actually manage to kick him out. Most social companies stumble and fall, Zuck has proven to be insanely talented at seeing the future trends. Think about their push to be mobile first, the acquisition of instagram, whatsapp, social login, shift of engagement to groups and chat etc. They clearly missed the changes in people's perception about privacy over the last few years, but if the past is any guidance they will probably overcome that hurdle as well.