I don,t think so that libra will replace the dollar becasue still no one conform that Libra coin is going to be high and it will officially launched. We just saw on news about libra, so wait for the launch date.
Now Libra is being developed in various options for providing only one of the currencies of the states, including the US dollar. How can Libra supplant the dollar if they themselves are backed by the dollar or, say, the euro?
Although the hype around the Libra project has subsided, there is occasional talk about the specifics of this future stablecoin. I no longer see anything special in Libra. And it makes less sense to launch this project, given the fact that digitized currencies of central banks of states, such as the digitized yuan, will soon appear and these stablecoins will presumably be in significant demand, since they will be backed by governments, not private or commercial structures.