Indeed, and I would frame this story as more the construction and operation of the Concorde was more ahead of it's time than it's grounding a step backwards.

The way I see it: there is simply not enough wealth accumulated to keep these flights running. Perhaps in a future world were aviation kerosene is cheaper, engines more efficient, and airframe and power plant maintenance more heavily automated, we'll see a revival of supersonic transportation. Until then, I'd rather airlines not bleed money keeping these planes flying. One might get teary-eye'd over the shuttering of the program, but more efficient allocation of resources is a real cause for celebration!

The notion of "'progress' at all costs" is an insane one.