A far better step would be to provide calorie counts right on the menu board, so consumers would have that one critical piece of information before they placed their order.
This information on the package is useful, but it doesn't offer people an opportunity to compare products, ... Having it on the menu board would spur a lot of people to switch to a smaller order of fries, a diet soda, or a regular hamburger instead of a cheeseburger, for instance.