The best-selling financial book writer "Rich Dad, Poor Dad" said Bitcoin would replace the US dollar, which he called "counterfeit money." In the April Sane Crypto podcast, author Robert Kiyosaki said the practice of printing more money in America was to create bubbles that would explode. "I think the dollar is toast because gold and silver and cyber currencies will take it," he said. "The US dollar is a fraud. I think we are watching the end of the dollar. "
https://www.youtube.com/watch?v=unvFvAUCZEUIn my own opinion, its way too exagerated to say that crypto will replace fiat dollar because dollar is so prominent and stable in the world market. Crypto is volatile and some centralized coin in crypto make no difference, so dollar will still be the main currency that people can depend on. However, eventhough the dollar more stable but crypto is still making its way to be known in the world market.