It's good in paper but it's more complex at it seems, you need full cooperation for public and private sector so most likely they will clash in the end. Plus will government allow that kind of setup? I don't think that they would allow old and traditional just run over by crypto is this is what you are trying to drive out here.
That's being said-
Everyone can create money; the problem is to get it accepted--
Hyman Minsky.
If there's no tax, how do the central authority will develop the country? Who will fund them?
With or without transparent view of circulating supply on blockchain for each country (inflation based on growing population, number of new pensions... in last year or some other time period).
What if inflation/deflation arise in the economy? Can circulation of a single coin can be done both deflation or inflation? If not, the same of the current economy will be reflected again.