It is not a cessation of support. French will always be present in the administration and management of personnel. If someone has a PRB at any point in their training, even past primary training, a PRB should be conducted in the OL of their choice.
Once primary training is complete and focus shifts on employing the weapon platform, if the person will operate mostly in English once they are a TES, their operational training should also be in English. As aviation is mostly conducted in English during operations, operational training should also be conducted in English. At that point, the ability to fly in English should be a PO. And by fly in English, I don’t mean just speaking with ATC.
There is absolutely no reason however to not teach Grob, Harvard II, Hawk Phase III, Jet Ranger, Outlaw and King Air in French as well as English.