This doesn't solve the problem of rude adults at the movies, which in my experience is far worse than the occasional disruptive kid. The people who were sitting behind me at the AMC in Burlington and talked through the entire movie (like, ongoing conversations at normal volume) on Wednesday night were well over 12. I don't really think kids are the main problem--plenty of people don't know how to behave in public and don't have respect for the people with whom they share public spaces. Banning kids doesn't solve that problem.