Well cash retains its dominance in many parts of the world due to stability and universal acceptance, while in my opinion cryptocurrency is rapidly gaining traction as a futuristic alternative. Its decentralized nature, potential for financial inclusion, and technological advantages make it appealing, particularly in the digital economy. The choice ultimately depends on individual needs, technological infrastructure, and regional preferences. As the world moves toward digitalization, crypto is poised to challenge cash’s throne, but for now, cash remains the king in traditional transactions.
Crypto won't challenge cash's throne. CBDCs will do that. Heck, crypto will be outlawed by many countries once central banks start rolling digital currencies of their own. All in an attempt to force people to use the new Fiat money system. Bitcoin will continue to be regulated to a point where you won't be able to use it as "digital cash". Buying and selling of BTC will be made mandatory through centralized exchanges.
For people seeking true privacy and freedom, Monero would be their only answer. I think even physical gold and silver coins/bullion will also be used as some sort of "cash alternative". We can't predict the future, so let's hope for the best.