But I'm sure in the future, I don't know when that will happen. crypto will remain crypto. Will be used for large-scale buying and selling. But it's different from Fiat. So what happens in the future? Physical money will disappear and can no longer be used because it is a hassle. Same story with the disappearance of the Barter system. Bitcoin will be paired with Gold for buying and selling. Ultimately, we thank the Fed, as their tenure in the world economy has come to an end.
I get that cash will be supplanted with credit cards etc. (including payment systems like ApplePay or PayPal).
And yes, gold is a good analog for Bitcoin: people buy and sell it all of the time, and use it as an investment, but you don't see people going to a restaurant or even a car dealer and handing them some gold bullion to pay.
Lots of people here keep repeating the theme of the Federal Reserve being diminished somehow but I don't see any connection to the conversation. The US Fed is as prominent in the world economy as it's ever been, so why would it diminish? And what would crypto have to do with it?