Nicole said:
I can see massive backlash because of privacy concerns.
100% agree with this.
That said, even though people may be super uncomfortable at the point of initial setup, I don't think any real notable percentage of guests will opt not to participate in the system. Hell, give it some magical Harry Potter-related name and suddenly people will line up for two hours to have their identities stolen. I can see it now,
The Hogwarts Student Identification System brought to you by Equifax.
There is a bit of sarcasm here, yes, but at the same time, I sorta do believe that Disney and Universal could do almost anything and the people who traveled halfway across the country to meet Elsa from Frozen aren't going to let a little privacy invasion stop them.