In the saddest possible way, I think the US learned the lesson and won't engage in a classical on the ground warfare against a country like France. To start, France is a nuke holder with bases around the world, so the stakes are that much higher. And as you point out it already has an history of resistance and fighting to the bitter end.

So the only option an actual war would happen is IMHO extremely violent and short-lived, Hiroshima/Nagasaki levels of impact. I don't know how that would happen, and also don't want to know, but I see it at some rhetorical probability.