Cryptocurrency in country's economy

Imagine this, having cryptocurrency legalized to a point where payment accepted in any shops, it would be a great dream.

Transaction time would be fast and fee or taxation would be lower meaning higher GDP / capita even better everyone get safety benefit of decentralization. In fact no more regulation, more liberty for people. Creating their own currency by the goverment like USD, EUR or even Canadian Dollar. Meaning investment would be more worthwhile along with Proof of Stake for passive income for unemployed people.