Just a thought.....Couldn't this feature be adventagous in lost child situations. I, personally, would feel better knowing that if my child were to become seperated from me or lost, a CM could easily scan his bracelet and use the information to determine who he is and retrieve my cell phone number. Heck the bracelets might could even be linked up and perhaps my bracelet could be scanned and my son's location be determined (like GPS). I know that's a lot of "big brother", but if it were the case of a missing/lost child, I would be super happy to have the technology available. Just trying to look at it from another perspective.

If I did this I would give Disney as little info as possible. I don't particularly want personalized experiences and I would never charge using a wristband. I would imagine that you wouldn't be forced to tell them everything. I probably wouldn't wear it but would put it away somewhere. I'm not comfortable with tight things on my wrist.
I'm wondering how would this thing track how many people are waiting for a bus? I noticed a PP stating that this would be an advantage.
A long range RFID receiver would be installed at the bus stop. Every MagicBand within 25 ft would be detected. Simple job for a computer to track how many guests have been waiting, and for how long. As buses arrive, they can be directed to the stops with the most waiting/longest waiting guests. I think Disney may do this manually with spotters at the parks. But this could automate dispatch.
I do not recall any announcement that Disney is contimplating this.
It isn't just buses either. The data that these bands can gather (which so many people seem to think is some sort of spying facility) can make a massive difference to guest experience in ways that are no completely obvious. Crowd management, transportation, CM deployment, management of ride breakdown, line control, finding lost children, providing discounts for things guests actually want.
Stop and think about this technology with an open mind. Assuming it's just some sort of "Big Brother" initiative because "Disney want to spy on everything I do and I don't want them to know what what I'm doing" is taking a really narrow view.
Imagine what this technology could do in an average trip to WDW if the possibilities are implemented. People think that data gathering has some sort of bad motivation on Disney's part, they don't think, well actually, the more Disney know about me and my family, the more they can cater to us and make our experience better.
To put this in context, if I don't like coffee but love frozen lemonade, sending me a coupon for Starbucks means nothing to me, but a coupon for frozen lemonade might put a smile on my face. Giving the best experience to guests is far easier and far more effective if you know what the guest wants and what the guests frustrations might be.
Another example of how this technology might improve guest experience is in the in the case of ride breakdown. Imagine being in line for 40 minutes to ride Space Mountain only for the ride to breakdown. I might be really irritated and frustrated by that. I'd be less irritated and frustrated if a free ice cream was beamed to my account or a FP for another ride etc.
We don't know what this technology will do and how it will be implemented but there are a lot of possibilities!