The thing with Libra is the userbase is going to have by default. We are talking about Facebook, Instagram, Whatsapp
Instagram - 1 billion monthly active user
WhatsApp - 1.5 billion active users
Facebook - 1.7 billion active users
To put this into perspective
Coinbase - 13 million users
(all this data is from Google search btw)
They will easily become the most used token in the moment they release it. Also it will "enable banking" to a lot of people that only have a mobile phone and not a bank account. They will probably win the race as well of being easy to use as everything will be done in the background.
I don't like Facebook as a company, and there are a lot of privacy concerns. But also this could open the door for a lot of people into the crypto market or be used a fiat gateway.
If you are counting users from all of the facebook's companies and then we can assume only a few percent that really understand about crypto. To use the overall total users from all of the platform that owned by FB is not a good example.