The XRP interledger will connect all other ledgers, whether fiat or crypto. The interledger will be truly decentralized and not controlled by any one nation, bank, or institution, including Ripple themselves. It is something all nations can agree upon and use, as XRP transactions take 3 seconds and cost fractions of a cent. Compare to SWIFT which is expensive and takes 5 days.
Central banks will likely begin this year diversifying their foreign exchange reserve accounts with the top crypto assets. The rush for regulation is creating volatility in the first phase of the crypto market, but will allow for massive institutional money to enter during the next phase. Nothing in its digital version has failed. This will be the same with money. Fiat currencies will be replaced over time with their crypto versions.