It really depends, Zuckerberg is doing a shit job now, and guess what? That's reflected in the stock price. Capitalism generally works.

I have no doubt that Zuckerberg did a lot of really visionary things & brought a lot of innovation to social media in the early days of facebook's development. He entered into a highly competitive emerging area & emerged victorious because he was able to mastermind the best product.

Of course he's made a number of bad decisions in the last few years that have a lot of people bearish on Facebook's future.