Is that unlikely? Yes, very.
You know what I think is more unlikely? Someone actually sneaking into in a case where this ID card would keep them out. I can't imagine a single reason students couldn't just punch a number to do all of those things, and save the school system money that could be better spent on any number of things.
That will get the vast majority.
And yes, I totally get that RT has no problem pushing bullshit; I agree. Doesn't mean we should discount it completely. We could miss a chance to improve.
Students are devious. If you punch my ID monday, I'll punch yours Friday. (in a non-creepy way, of course)
This too shall pass.
The teachers will finally catch on when there is only one student in class, with 30 tags in his pocket :-)