I would imagine that Disney IT has a backlog of projects that they would like to do Then they rank these according to how much revenue they would generate. The ones that generate the most revenue get funded. Unfortunately, baking the
DVC discounts into the Magic Band would generate negative revenue, because 100% of those eligible would take the discount as opposed to just those who think to bring and use their membership card. It would increase customer satisfaction at the expense of revenue. If there are projects that increase customer satisfaction and also increase revenue, that would get funded at the expense of projects like this.
However, it is possible that it could be a revenue enhancer. Disney trinkets that are sold in the parks tend to be impulse items. If you have a process that stifles the impulse because you don't have your card with you, it eats into sales. By the time you think to get your card, you may not return to that shop or even that park.
There are many ways to implement this from very low capital investment to high capital investment. An option with high capital investment would require that there be additional revenue generating opportunities beyond quashing discounts. For example, you probably could not justify installing fingerprint scanners if all they enabled was this.
Here is a partial list.
1) Rely on the PIN, which you already need to make a charge with your Magic Band. This is deemed sufficient ID to enable thousand dollar purchases, so it should be sufficient.
2) Apple Pay. This is already working everywhere they accept magic bands, and Apple Pay is secured by bio-metrics. You could tie the
MDE app to Apple Pay and have foolproof ID. And the customer pays for the capital investment because they have to have a phone or watch. Presumably Androids could work as well, but I am not as familiar with Android Pay.
3) Embedding a photo ID into the Magic Band itself.
4) Fingerprint scanning. This is done at park entrances, and could be done elsewhere, but seems overkill for the risk they are protecting against.
5) Scanning your shoes. Disney recently patented this.