Yes u have a good point, yes this could/can happen and yes France and following EU rules are not on one and the same frequency - however without wishing to be pedantic the rules do not indicate a formal Europe wide ban but merely the means by which a limited number/certain specified airports can action their own (effective) phase out - the non Stage 4 acft will either have to operate to airports not entitled to such action and most of those anyway will no doubt jump at the business