YET, next time they need to go from A to B, if on paper FR are significantly cheaper than the next airline, these people WILL go with them.
I'm not sure which group of people you're speaking for, but I can assure you that I take into account more than just the price of the ticket when I travel in an aircraft I'm not flying myself. For most destinations we have a choice of carrier - a point not lost on customer-orientated airlines.