Thanks to everyone for the answers.

If I understand correctly cryptocurrency will not replace the currencies of the world economy at least for now.
Will they only be used for online transitions or even to keep banks and large financial companies under control?

Or maybe the dollar (or other current currencies) will implement the blockchain for managing transitions and technological innovations (smart contract).

New project like "Raiden network" and "open Bazar" can have a huge impact in my opinion in the future of currency transition.