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?
Why will you ever think Libra will bring down Bitcoin's dominance? There are a lot of good cryptocurrencies whose ideologies are bridging gaps seen in the financial ecosystem but these coins haven't been able to bring down the dominance of Bitcoin. Libra will just be one of those coins below bitcoin.