The taxi union is actually used to having a monopoly on travel to the airport[1][2]. So they actually have been able to claim that exclusive right, as absurd as it seems, for a long time.

[1] http://www.connexionfrance.com/paris-taxis-keep-monopoly-cha...

[2] http://thenextweb.com/eu/2011/05/07/disruption-in-france/#!r...