Given that the names of the restaurants are printed on the back of the voucher I would not think that they can just decide not to participate. If I had gone to the trouble of going all the way over there, picked out my food and then found they were no longer accepting them I would walk out and not pay for the food (which is over priced as it is). We are not going to test it out this trip, as we have in the past and I'm really not that impressed with their food, the process by which you go about doing it and the expense for the kids meals that we usually end up getting as well. If we were staying there we would be more inclined to test it out.