In my opinion, as for the moment the world is seeing stable coins as a potential beta for the transition of fiats to cryptocurrency. But still, government will make a massive decision regarding this, as it seems impossible at this moment to transition the products market price, bar codes and other pricing aspects so it needs to take time at a time to be implemented. In addition taxation of all prosucts and services needs to be studied first.
I am seeing more of the possibility of physical fiat transforming into digital fiat as compared to physical fiat becoming a stable cryptocurrency. If the government wants to preserve fiat, its value, and its prevailing rules, why do they have to shift to cryptocurrency? It is not needed anymore. They better shift to digital fiat. In that case, they are still fiat and I will still prefer crypto over them.