The idea of pegging a currency's value to a basket of existing fiat currencies has already been done by the IMF as Special Drawing Rights[0], where Libra's goal is to extend a similar functionality into a living digital payment system. Transfers of XDR are restricted by its issuing bodies only to nations due to the large amount of risk bourn by having the ability to print an unlimited amount of currency, and a continued guarantee for the currency to remain solvent against its allocation baskets. Governments are right to see this as a competitor to central banking as the network operates outside their jurisdiction (including the IMF'S), avoiding payment monitoring networks like SWIFT, and Libra doesn't seem to have a well-defined plan in the case of a major liquidation event.