Good point what you mention, however I think the issue Libra has a lot of fabric to cut, is already on the table his new and not yet launched virtual currency. but also the congress asked that not yet release its currency, they are asking for information and facebook is in the obligation to show its transparency will be a blockchain but we will see the cost of its opening in the first month after entering the market officially.
For now only in many publications we will only read many conjectures, ..ot combine Steemit with FB
Very warm greetings from Venezuela