The best I can figure is that this means a big shift back toward KTTW cards.
There have been multiple suggestions that everyone has draws full of magic bands at home anyway, but they really don't. My suspicion is that international guests in particular are also going to be reticent about being so reliant on having a working, charged phone throughout their WDW stay. So at least for that demographic, they're just going to have to go back to cards.
Wouldn't everyone ask for a KTTW as a backup anyway?