Personally, I don't think it's easy to destroy or replace cryptocurrencies. Because as far as I know, currently crypto currency is the best digital currency. A big example is bitcoin, with its decentralized nature and also its ever-soaring market price, which will continue to attract many people to buy bitcoin. Apart from that, bitcoin has also been legalized as currency in El Salvador, this is clear proof that cryptocurrencies like bitcoin have advantages, so that a country can really trust it to be used as currency in its country. Therefore, I personally think it will be very difficult for other digital currencies to beat cryptocurrencies. Because in essence, cryptocurrencies can currently be said to be a very big trend, and apart from that, cryptocurrencies also have very complex uses. And don't forget that the cryptocurrency community is also huge right now. So in conclusion, I personally am not sure that currently there is another digital currency that can beat cryptocurrency, even in the next 10 years I am sure there will still be no digital currency that can beat cryptocurrency. So I think your assumption is a little inaccurate on this matter.