Many have tried, but people keep using what they are used to. Same with Bitcoin. People will keep using their convenient credit cards regardless if they are a superior or a subpar technology. Until Bitcoin diehards get this simple fact and quit spreading delusions that Bitcoin is replacing cash, credit cards, and Western Union, people will not take them seriously.
Centralized technologies: Compuserve, MasterCard.
Decentralized technologies: The Internet, Bitcoin.
So you're saying both can work?
Cash and credit cards, no, probably not.
But if I were Western Union I'd be shitting bricks.