While it's true that he incorporating bitcoin into his company is a step forward in technology, I doubt that he will need it to earn more money. As you said he's already third in the richest dudes in the world. How much do you really need to have a good life?
I just noticed that facebook has some ads about cryptocurrency. well, I think facebook is beginning to support that development. well, there is no definite announcement, but I think slowly, facebook began to accept the development of cryptocurrency.