I assumed that Zuckerberg was looking at the future of Facebook, which would be slow or stagnant growth, and revenue that was worryingly reliant on rival compan

I assumed that Zuckerberg was looking at the future of Facebook, which would be slow or stagnant growth, and revenue that was worryingly reliant on rival company's platforms. He saw a risk. He said something like "My company will become irrelevant unless we do something really big. What moonshot, no matter how crazy sounding today, might possibly become as big in the 2020s as social media was in the 2000s?" and the thing that seemed possible at the time was VR. Probably a lot of people told him to pump the breaks, but it's his company, so he bet on his belief in himself as a visionary. I guess we'll see.