Why tie the RFID to the cup? They should tie into the KTTW cards.
If I buy the mugs or a dining plan that provides refillable mugs I should be able to walk up to a machine, swipe my KTTW card, and get some soda....regardless of what cup I have. A time delay could be added so some people do not take advantage.
I have no clue if the refillable mugs are supposed to be used in the parks. I thought they were only supposed to be used at a persons "home resort". However, charge me a little more and allow me to have unlimited drinks the length of my stay ANYWHERE I EAT. And I shouldn't have to take a bulky mug with me.
I walk up to a paper cup dispenser, swipe my card to get a new cup, walk over to the soda machine and swipe my card again to fill up the cup. The supposed additional $.24 per mug cost becomes a non-issue with the tie-in with the KTTW cards and we, as consumers, would have more flexibility.
Just my $.02