French style yoghurt is an entirely different product than Greek yoghurt. Greeks, Turks, and Persians typically eat their yoghurt with hearty meals; with salads, meats, soups and rice.
French yoghurt is a dessert, but yoghurt as a dessert just isn’t popular. People are stepping to Greek yoghurt (it has multiplied over 4x in sales the last 10 years) simply because it’s a healthy part of everyday diet. Also it’s great exercise food in between meals to supplement protein. What they can do is make it more interesting as a dessert, aim at younger audiences or they can make a great packaging so people will want to keep the jars.