Cash may no longer be king because of the advent of digital currencies and cryptocurrencies, and people are increasingly preferring them over cash because of the convenience they offer. But I don't think cash will be completely eliminated in the coming decades. Many countries in the world are not ready for the cashless era yet because as far as I know, the world's population with access to the internet and smartphones is not yet 100%. So eliminating cash will face many challenges and cause difficulties for those without access to the Internet.