The question is how the people, will reacts to this. I'm pretty sure the people will be FOMO in this once this becomes a reality. Not by being a strong platform or good aspect of Facebook but the hype that it is own by Facebook. Zuckerburg pretty knows how to trick people. He is an asshole if you noticed last year, He said he support crypto then ban crypto ads on his Facebok.
Remember the coin that will be created by FB will be used in all of the platforms that a part of facebook companies itself. The adoption needs the time and you can't feel skeptic about that. I just try to remind you about that. FB has a lot of way to create mass adoption.