Do not compare Libra over Bitcoin. That is like comparing Bitcoin with kardashiancoin, or trumpcoin with Bitcoin. That is, in all honesty, a stupid comparison. Libra is even having a hard time getting accepted by the crypto fans and supporters. Bitcoin on the other hand did not have to go through unnecessary hype to get accepted by the people.
I see it in a neutral manner, which means that the possibility of Libra Coin changing the position of bitcoin can occur, but whether it will come true or only time prediction will answer it.
If you see the background of Facebook as a social media that has many members throughout the world, of course, in theory Libra Coin will be easy to sell, but in practice it is uncertain. Because Facebook members don't all like crypto currencies, because they still like fiat money.