I would like to play devil's advocate
From this article I read
“Unlike the volatility seen around other cryptocurrency’s in the past, we believe that Libra’s focus on creating a stable, low inflation currency backed by a reserve or real assets is a differentiator. Further, unlike other stablecoins, Libra will not be pegged to one currency but instead a basket of assets ranging from bank deposits to short-term government securities.”
https://www.cnbc.com/2019/06/18/the-difference-between-bitcoin-and-facebooks-libra.htmlWill Libra Coin bring Down Bitcoin's dominance in the market, your thought?
Libra is completely different platform from BTC. Libra is just a digital money which will be controlled from a center. You can close Facebook, you can close Libra, but you can not close BTC.
The world of Libra and BTC are completely different. Libra has nothing to do against BTC.
Libra can push the price of BTC. As Facebook, whatsapp etc have million of users, people will learn the term digital money with Libra. After digital money, they will have chance to discover crypto currency and also Bitcoin.
So it is good that project like Libra or now Venus (digital money project of Binance) be online. So crypto world will grow faster and faster.