(original comment below)
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I can appreciate the logic behind a ban on this for single-hop trips.
But if you're flying into a hub and want to connect to a smaller city -- e.g. Paris to Lyon -- switching to a train is massively inconvenient. You've got to travel into Paris (an hour?) and then take another 2-hour train, after you're already tired from your transcontinental flight.
So... do I have this right that I won't be able to fly from New York to Lyon, it just won't exist even though they both have airports? I'll have to fly into Paris and add 3 hours to my already-long trip and make a totally separate train booking, and worry about if lose the train ticket if the flight is delayed?
Or because Paris as a hub is out of the picture, will I just book a flight via Brussels (New York -> Brussels -> Lyon) because that will still be fine...
...and burn a ton more CO2 because I'm forced to take a longer flight because France banned shorter ones?