I have positive approach for this topic,It is possible and government will adopt it may be not early but in future .Adopting crypto will be need of government.Its era Of modern smart technology and new generation sick of from old trends like traditional banking systems.Artificial Intelligence overtaking the corporate sectors why Because Artificial Intelligence more productive than manpower.
Cryptocuurency save our time and no need of any third party to make transaction locally or globally,This is reason business tycoons and investors attract from the crypto and use it in daily life.
I am sorry for contrasting what you have said but I dont think that the cryptocurrency will be adopted by the government because cryptocurrency's price in the market is not stable and needs a lot of improvement and besides there are a lot of things does the fiat can do but not the cryptocurrency coz as what I said it needs more improvement.
Just like what I think that in my opinion the government will not adopt cryptocurrency as a means of payment later because we know that cryptocurrency is unstable and also now fiat currency can also be used without having to meet face to face and we can make payments using the internet using fiat, so I think there is no way the government will adopt cryptocurrency as a means of payment. But, what will happen later we do not know, this is just my personal opinion.
Maybe that can happen if some disadvantage are being solved and being innovated. Government can really adopt cryptocurrency, but to replace fiat that is not sure because we are now used to use fiat when buying something. And one thing also, there are still some countries that are banning cryptocurrency for some reasons. They are thinking that this is a scam and the real thing about that is because they cannot charge users taces from using bitcoin. We all know that cryptocurrency is decentralized, meaning there are no group of people who are organizing or running cryptocurrency.