I suppose the Prod. Co. will keep it going until it is sold out or until the new Billy arrives at the end of May at which time they can get him into the new programme and the deaprting Billy out.
That is exactly what they will do. They certainly will not dump the leftover supply of anniversary programs in the bin. Personally, I was glad to see them still on sale last night so that I could buy one to take home with me.