You don't know what someone's going to walk away from a movie with but you hope it's something positive but if nothing you want them most basically to be entertained and engaged. That's your job. But you also hope to give them something to chew on or maybe some insight into the human existence you hope a little bit. Not to sound too lofty.
The greatest revolution in our generation is that of human beings who by changing the inner attitudes of their minds can change the outer aspects of their lives.