Well I also forgot to include the amount of money they will be saving on not having to maintain magnetic card readers, which wear incredibly quickly. RFID readers involve only solid state parts.
Someone questioned the KTTW doing exactly the same stuff. And it does, it's a credit card they have all your personal information stored in a central database, every time you enter a park, get a fast pass and buy a turkey leg they know about it. Again instead of swiping you will now be tapping. Plus the new system ties into the apps, and other future interactive products which would be to costly and cumbersome with magnetic card readers.
Finger Prints, don't even get me started. THEY DON"T TAKE YOUR FINGER PRINT. The two finger machines they originally had measured the gap between your fingers, and that was tied to your ticket. The current machine takes multiple points of, yes your finger print and assigns it a unique value. That is compared each time you scan. But your finger print is not and has never been stored. Again we are all incredibly unimportant in the grand scheme of things for Disney to keep and store our finger prints.
That being said the new entrance area of MK with the MagicBand readers had no finger scanners. Only a CM with a PDA to barcode scan tickets and the golden Mickey pole to tap your wristband.
People are really in a tizzy for no reason, and as Iger said if you don't want to participate, then DON'T.