I seem to remember some pundit stating they believed the reason AT&T agreed to the initial pricing in the first place was that they didn't think many people would be using 3G on the ipad, preferring wifi instead.
Can anyone find that quote or story? I'm drawing a blank, but it seemed to be one of the stupidest things I'd read in a while at that point.
My guess is that people have been using so much 3G data that AT&T realizes they'll be in a horrible situation as the iPad adoption grows - could be 4-5 million 3G devices with long battery life basically in an 'always on' state, using up far more bandwidth than anyone predicted.
That said, I just can not figure out why people can't seem to predict this. Most active users (the early adopters) can easily use 5-10 gig on a ipad as part of their 'always on' lifestyle. This isn't rocket science.