I'm just amazed that Disney has not implemented RFID into the wristbands. They could give you a nice plastic wristband, like a cheap watch wristband, when you arrive at your resort. Now, if you forget it at the hotel, just go to guest services and show your Key to the World and get another. If you lose both IDs, you would use your driver's license or state ID just like usual to get issued a new key and also the wristband. Ah, maybe even a $2.50 penalty for replacement. But, here is how they could be used:
1. At attraction entrance, wave your wrist past a device to get in. Greeter watches, and makes sure that the counter increases 1 for every guest that passes.
2. At restaurant locations, counter service specific, just wave your wrist to charge your room for the ymmy snacks.
3. Use the wristband in conjunction with the biometric scanners to move into the park a bit faster. Much easier than trying to get the card into the slot. Public transportation systems like the CTA are using them now, and they really do make things faster. I walk at a normal pace through turnstyles now, not even stopping my stride to swipe. I hold out my card, it gets scanned as I walk.
4. Extra fun, like entering contests and little bits of magic. Imagine if the proximity was really good. Then a ride like Haunted Mansion could show a ghostly projection with your name on a gravestone as you ride past the hitch hiking ghosts.
RFID is way underused at Disney parks. Not only could the EMH be improved, but I could see a whole host of opportunities possible with RFID and other proximity card technologies. Especially because they don't necessarily need to be in "card" form.
Ryan