I disagree. I think fiat currencies will exist as long as nation states exist. Bitcoin will remain an underlying asset, For those who know, But will never replace all nation state currencies. Some countries are still doing very well economically. Denmark has a 38% debt to gdp ratio and never adopted the euro. Bitcoin as legal tender or for an asset to add to its balance sheet is best suited for non competitive economies that perform poorly against more developed countries who already have an abundance of resources. There will be winners and losers and bitcoin is best suited for the losers.