Did AT&T say how long is it good for if you don't change the plan? In the Terms & Condition, it states AT&T can change without notice.
They don't have to honor the iPad's price for the customer since they aren't in a contract.
Likely, there was a clause somewhere Apple and AT&T signed giving 60 day headway.
Well if the current bait and switch time span is any indication, we should see the end of the grandfather clause in about 60 days. That would officially make for the world's youngest grandfather, at 2 months old.
Just because data is "unlimited", that doesn't mean you should suck down 100 GB/mo just because you can.
You need to make just one trip to Country Buffet to learn why advertising anything as "Unlimited" quickly becomes a bad idea for everyone involved.
OTOH if it really is a small group of data pigs that is sucking down 100x the data of a typical user, AT&T would be smart in kicking them off after a year or two. Just because data is "unlimited", that doesn't mean you should suck down 100 GB/mo just because you can.
They can also go after people like this guy who started "testing" the unlimited service back in early May and was clearly abusing the service.