Kohn’s Corner is a weekly column about the challenges and opportunities of sustaining American film culture. It can be a dispiriting experience, I’ve learned, to emerge from the Cannes Film Festival and reenter a world where original cinematic achievements barely have room to breathe. Last week, I was sifting through new work from Jonathan Glazer and Nuri Bilge Ceylan in the south of France while “The Little Mermaid” dominated the U.S.