(In French.)

That could be a massive hassle for American tourists, who will still mostly have Visa and Mastercard. I'm sure that there will be some kind of solution -- I suspect Google Pay and Apple Pay will support the new network. But I'll have to keep an eye out.

I might even have to start bringing cash. I used to make that the very first thing I did on landing. The last few times I didn't get any cash at all.

This is already an issue for tourists in many countries that have their own payment system (e.g. Brazil, India, Singapore, Thailand). In some of them you have companies that came up with products for tourists that allow them to pay but they usually come with fees. From what I know the majority of tourists in these countries just travel with cash.

Those merchants will move to supporting more networks.

It's the same situation as Diners or Amex, they're supported wherever the merchant felt it made sense to go the extra mile. Touristic places typically pay attention to that.