That's the plan. Eventually, EVERYONE will have a band, roughly in this order.
1. Select WDW resort guests
2. All WDW resort guests
3. DVC members and passholders
4. Day guests
5. Cast members
Regarding "missing the magic," when Iger said "optional," he was referring to the personal information you provide. Using the band as your room key and ticket media will be pretty much universal once fully implemented. Everyone will eventually have a band but you don't have to tell it your name is Joey and tomorrow is your birthday.