In this life nothing seem to be impossible, the coming of crypto was never thought that it will get to this tremendous popularity and adoptions as it is today .it started like a play thing but is has withness unpresentable growth.
Now, Fait is control by government but also remember that fait was invented on a certain day, and may not be out of place to say that some day, fiat may be remove by a more popular means of transaction. I think digital money is gonna take charge in future wether government accept it or no.