For me, the economy will be imbalance if the government will suddenly adopt cryptocurrency or implement it in replacement of fiats. What they need to do is to convert the fiat first to crypto, because when time come, those that aren't wealthy before will suddenly becomes rich because of crypto. But I am pretty sure that when it will going to happen, government or financial institutions will take it slowly but with assurance that it will yield for the greater good.
The attempt it looks they are taking is slowly incorporate blockchain technology into their payment systems, and the first wave of this is in the stablecoins that are getting attention since they are much safer then Bitcoin and other crypto-currencies.
After that's done, we might see Bitcoin and other crypto-currencies be implemented as a true payment system on the existing network of stablecoins and government-created crypto-currencies.