Disney probably doesn't need a blockchain, but they do a fair bit of research. Considering Disney already has a relationship with its customers, a centralized system works best. In fact, this is what they're doing now with their wristband payment/identity system. Considering they just invested $1bn into this, I suspect they're going to be using it for quite some time.
While Disney Dollars are no longer produced, I can see them used in other ways. If you haven't been to Walt Disney World (not Disneyland) in the last 2-3 years then you might not know about their MagicBands. They are a RFID wrist band that you basically use it for everything. To get on the Magical Express from MCO, check in at resort, open your room door, park admission, fastpasses, dining reservations, dining plan information, gift shop purchases, etc.
[1] https://pbs.twimg.com/media/Cn2zMbTWYAAQA6i.png
[2] https://media.licdn.com/mpr/mpr/shrinknp_400_400/AAEAAQAAAAA...