What are the chances of living in a world with no actual money ? 
Low. I think personally that cryptocurrencies wont make FIAT useless, but I think that cryptocurrencies will work hand-in-hand with FIAT money. Especially in countries like the United States, and the other first-world countries; I don't see FIAT going anywhere soon.
1. Flat money represents a country, the government of respective countries dont want to lose soveriegnity
2. Since bitcoin is decentralize, government wont make it their prime currency
3. Energy efficient, it is easier to give flat money to a merchant when you are in face to face rather than use a cp and drain your cellphone's battery.