You are correct in your analysis of the impact that a "tourist boycott" by Americans would have on the French economy.
Americans, in spite of the standard "ugly American" label, are excellent tourists from the economic standpoint. They tend to stay in upper tier hotels, do not scrimp on meals and are inveterate shoppers.
I was lucky enough to draw Strom as a dinner companion at a DC dinner a couple of years ago. He recounted his experience of landing in a glider in the Normandy invasion. He had resigned his judgeship in order to enlist. He's a great American, and I wish him a wonderful birthday.