I think it was a great idea to launch their own token since it was their country that is going to use it but I think these token could not be more useful since France already have its fiat money and bank system.
Also, France should just use bitcoin since the bitcoin is the most popular cryptocurrency and digital currency they should just use it as the cryptocurrency and as an asset.
Again the money in france is the Euro, so it will be the first step to a new money for the European Union maybe. A government will not use Bitcoin because they don't own it and they don't know who own it. Imagine if one day "Satoshi " sell all his bitcoin ? He will create maybe a new crisis. Imagine if you loose your wallet, bam all your money is gone.
The goal of a state is to protect the citizens, too many risks to adopt bitcoin as a national money.