On the move, new technology seldom turns back to old, financial world already indicating shift.
Implementation, Much like credit card system it takes time. Visa card system started in 1958, only became popular in the 1990's when people understood/trusted more about computers. With Covid, people now tap the card in preference to touching key-pads, this took a 'pandemic' to move many. 1970's when we traveled each country had their own currency using traveler cheques, form of promissory note between banks. 1990's e-banking and start of digital banking.
Agreement, blockchain technology is going to change much in the world. Big changes started happening about 5 years ago in FinTech which encompasses everything you are saying.
People have always traveled, traded, used credit, new technology will allow for change in the way we do things going forward.