I live just outside of Disney property and we like to go to the resorts once in a while to eat. The Mara is a favorite spot in particular. People like to say Disney is usually ahead of the curve for these payment systems but they still don't even have the chip readers active for credit and debit cards.
The way things are in our society, it is incredibly easy for credit card and debit card information to be stolen. Some people find it easier to just use cash to pay for things. I'm not sure what benefit there is for me, as a customer, to not have the ability to pay cash for my food. We're actually going over to the Mara to eat tomorrow, and while I know this cashless system doesn't begin until next month, I wouldn't have known about it unless I read it here.
It's just strange and inconvenient not to take cash. Are they afraid that the cashiers are unable to make change or something?