This poses the question, "How old is old enough to tell my kid to go to the bathroom by himself at the movies?" My almost 10 year old is old enough, right?
I had this same debate with my wife last fall with our 11 year old daughter. The theater we go to is only a few miles from our house and (I condsider) very safe, however, the restrooms are down a hallway about 10 feet from the doors leading outside. It's a great design to keep people out of the lobby, but it's really scary when you consider how easy it would be to grab a kid and be in a car in less than 10 seconds. The abduction opportunity presented with parents being inaccessible is alarming.
We are ok with her going there during a matinee when the theater is less crowded, but I'm still tentative during an evening showing. I hate to have to think that way, but there are some really horrible people out there.
She's much more alert and responsible than I was at her age and I have no problem with her going to school and being home by herself for a couple hours. However, certain social settings put my fatherly skepticism on alert.