I never know going in if I've even got a movie to make. Once you start making a film, you hope there's going to be enough material! My job as a director is always to push for more.
You can't stop people watching on mobiles, but I hope the old fashioned idea of sitting in a dark room with a big screen with a group of strangers lives on forever.
Hopefully with digital projection, a film will always look the way the filmmaker intended.