I would like to play devil's advocate
From this article I read
Unlike the volatility seen around other cryptocurrencys in the past, we believe that Libras 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?
If libra is stablecoin there is no way it will bring down bitcoin, Bitcoin can spike anytime. So many projects have done that they have created so many btc forks and look at them now? btc is still the king. Its decentralized no one is backing it, just the support and trust of people is enough.