Folks I know just stayed at All Stars. They brought their old mugs and asked to see the manager before using them. She told them to go ahead and use them and not worry about it. They did not have to purchase new mugs. The manager was surprised, but impressed that they had asked beforehand.
At the same time, they saw others using everything from plastic and paper cups to popcorn buckets for the drinks. Those are the folks that will cause this program to be discontinued, not the folks who return with their mugs.