Well, then there's an easier way to shutdown this traffic, and let the market do its job : stop financing those airports with public money if they're not profit

Well, then there's an easier way to shutdown this traffic, and let the market do its job : stop financing those airports with public money if they're not profitable. And let the ones that manage to actually create an effective business model survive. But that's not how we french like do it, because it sounds too much like "laisser faire". Politicians want to show that they've acted, they like to spend money and regulate, it makes them feel warm and fuzzy inside.