I agree that the future of crypto technologies, blockchain technologies will change the world, the attitude to the world of finance, payments and such currencies as BTC, is already changing the basis of a payment service provider.
Yes, cryptocurrency will change the world in financial terms, but not everything will change. Changing fiat or real money with cryptocurrency as the primary payment tool will be difficult.
If the cryptocurrency will give a simple consumer a fast and stable payment speed, no fees and a high level of security and stability, the Fiat money it can easily displace