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If libra successfully enter the market we know that facebook is a really big media for it and US dollar might be threatened because people will use libra over traditional money. In the sense of Libra's advantages over paper money and it is a crypto money.
@Opekin Libra is facing stiff opposition from the G7 countries who see it as a threat to their national currencies, and Facebook has been notified by G7 that they wont approve Libra until all their doubts are cleared by the Libra team. Its pertinent to note that many governments are now in a race with Facebook to create their own stable coins, which puts further pressure on Libra to coexist between bitcoins and government launched stable coins.
Sources:
https://www.bbc.com/news/business-50037223https://www.cbc.ca/news/business/libra-digital-money-1.5342570