Many governments are looking at this option. Since the blockchain is relatively new and is yet to prove itself through time, it's only wise for the governments to wait a little and watch how it evolves. At the moment, many researches are being carried out about ways to implement this seamlessly without causing a hitch.
what you say can happen because of the development of technology and of course the blockchain technology will be very much needed in the development of crypto currencies and an increasingly advanced economy