Can the French cinema industry take on its biggest financial backer?

French cinema is reeling after the CEO of the country's biggest investor in films, Canal+, said he would no longer work with hundreds of actors, directors, producers and technicians who signed an open letter criticising the right-wing views of media mogul Vincent Bolloré, who owns a 30 percent share of the company. But given the number of signatories, can Maxime Saada follow through on his threat?