I'm not sure if it's the frame rate or the film itself. I know there a few directors who still use film to this day like Steven Spielberg. He recently said:

"I’m still planning to shoot everything on film. I guess when the last lab goes out of business, we’ll all be forced to shoot digitally and that could be in eight-to-ten years. It’s possible in ten years’ time there will be no labs processing celluloid.”