In France it has definitely become a niche sport. Back in the 80s and the 90s boxing was broadcasted on major networks and there were still a few decent athletes - Fabrice and Christophe Tiozzo, Khalid Rahilou, Jean-Baptiste Mendy, Julien Lorcy among others.
Cable TV took over, with a focus on major US events. The fanbase for pro boxing shrunk, local events became less and less attended, French boxer became journeymen, major promoters threw the towel.
Somehow in the 2000s France got its first Olympic gold since the 30s with Brahim Asloum. In 2006 he sold out a 15000 seat Parisian arena for his first world title bout, but he didn’t become a star. Jean-Marc Mormeck and Bruno Girard had a decent career but never did the same numbers.
With the bunch of medals France got in 2016, the media resumed talking about boxing. Yoka headlines local events and is broadcasted on cable TV. An event in Paris with Michel Soro and Arsen Gulamirian sold 10000 tickets in Paris in november, focusing on big boxing communities (Marocans, Armenians, Gypsies). Provided the biggest names keep on winning, boxing may become fashionable again, but it’s still to be confirmed.