Interesting thought.
Hotels have loyality programs - I belong to a number, and will base my stays on them sometimes.
Airlines have loyality programs, and somtimes I will make a choice of carrier based on them.
WDW is different. As Fosse said (and very often I don't agree with him) there is no other WDW. If I want to go to WDW and stay on property, I am stuck going to WDW and staying at a WDW hotel (well, there is the Swan & Dolphin). I don't have a choice of WDW 1 or WDW 2, there is just WDW. True, there are other theme parks, but they are all differnt enough to create a seperate market.
Disney's cruise rewards program is nice (Castaway Club) perks for return cruisers include priority boarding lines (just like my airline perks), the ability to book excursions and other events in an earlier window, and a welcome gift in the stateroom.
However, there is competiton with the DCL
I don't think it is something that is required for WDW. I also think it would be a bear to impliment. How do you define a stay? One person stays over a long weekend in Pop, and the other spends two weeks in the GF. Is that both one stay? Some people switch resorts in the middle of a vacation. Is that two stays ? Some people have DVC, but allow other people to use them, who gets credit for a stay? Too many issues.
-dave