That's the first time I am hearing about this. How can there be 80 different local currencies? Aren't people using the Euro anymore? It sounds a bit crazy for a country to have so many different type of currencies. In case there are fixed exchange rates between the Euro and the local currencies I wouldn't give too much weight for them, but if they are all trading freely and are being used in large scales it's an interesting phenomen. For small local communities it might work out to use their own currencies, however if you are traveling to the other side of France you will likely struggle to use your money. Bitcoin could be a great alternative for these communities that want to be independent from the Euro and have control over their own money. As long as France is not baning the use of crypto currencies there shouldn't be any problem for people to switch. The only problem could be if a large fraction of elderly people are using these local currencies, it might be hard for them to get used to bitcoins.