That's not fully correct. CDG and ORY have integrated (or close enough) high speed rail stations that serve other large cities, although that's probably not a great bet.
Most importantly, however, the law being discussed doesn't ban connecting flights. So a NYC -> Le Mans (say) would be allowed to fly through CDG, even though Le Mans is at around one hour by high-speed rail.
However, as there would be less traffic on these routes, I do expect some of them to be more expensive or even dropped altogether.
There's also a provision for "zero carbon" flights which would be allowed to operate on short distances.
CDG (North of Paris) is on the railway that joins Brussels, Paris, Rennes, Tours, Bordeaux and a number of other major places in France. ORY has a connection with Paris suburban railway network, no direct access to one distance train.
Right. ORY is very close to Massy TGV (2 stops or so on the suburban train) which goes to the west (Rennes) and south (not sur if Bordeaux or Lyon or both).
Most importantly, however, the law being discussed doesn't ban connecting flights. So a NYC -> Le Mans (say) would be allowed to fly through CDG, even though Le Mans is at around one hour by high-speed rail.
However, as there would be less traffic on these routes, I do expect some of them to be more expensive or even dropped altogether.
There's also a provision for "zero carbon" flights which would be allowed to operate on short distances.
The actual law (in French): https://www.assemblee-nationale.fr/dyn/15/textes/l15b3875_pr...