Libra will be able to beat some altcoins. But I don't think that this will globally change the market. In my opinion the place of Libra in the top 10 or 15, but no more.
yes, it can be said that Libra will be one of the good coins when it's released, and there's no doubt that Libra will defeat many existing altcoins first. however, I think it takes time to beat coins like ETH, even though it really does become a very good competitor for altcoins that have become popular.