I believe you're misinformed about how easy a switch this whole thing would be. There are several variables that will cause problems.
First, guests are unreliable when you put decision-making in their hands.
Allow them to "opt out" of receiving a MB and you're going to be flooded with guests complaining that they never received their MB. Yes, the guest would be wrong, but they'd still be unhappy and that's a problem.
Second, this is all managed outside of Disney's shop. The logistical mess of creating exceptions for eight different classes of guest is a nightmare.
- MagicBand, booklet, DME tags
- MagicBand, booklet, no DME tags
- MagicBand, no booklet, DME tags
- MagicBand, no booklet, no DME tags
- No MagicBand, booklet, DME tags
- No MagicBand, booklet, no DME tags
- No MagicBand, no booklet, DME tags
- No MagicBand, no booklet, no DME tags
And what if Dad has a MagicBand but junior and mom don't? But junior ripped his sizer off so he needs an new one anyways. Today's process is simple. DME, yes or no? That's it. Again, the number of guests who say
on property every single year (the window when you can reliably count on the MB's battery) is extremely small.
Finally, the dollars and cents. I bought MemoryMaker based on the promotional material I received prior to my trip. I absolutely loved the product and will buy it in the future. That's a win-win for Disney, who gets my $170, and me, the satisfied guest with a pile of wonderful pictures.