I know it sucks they did it right away, but the reality is given what was set up, the pricing and bandwidth limits were always subject to change. Not having a contract cuts both ways.
Nobody promised you $30 unlimited access forever. What if instead of changing the product, they kept unlimited but raised the price to $60. Would you have felt that was okay? It would have met your criteria that you could turn it on and off whenever you wanted to do so. Yet it would be significantly more expensive.
Subject to change, but change within a month of release is a pretty underhanded thing to do. Certainly within their rights, but a crappy move none-the less.
And frankly, yeah, I'd be very happy with a higher priced unlimited option in the mix. I'm one of those folks that specifically waited for the 3G so that I could have the option to cut an 3G UDP on and off when I travel (as I am well past dealing with shoddy hotel WiFi options). Now, I can't do that.
Like others, I"m not yelling and screaming about this, but I'm just disappointed in the way the whole thing worked out. It was the final nail in the coffin of the AT&T/Apple alliance as far as my cell phone goes. I'm going going to be making the transition to a Android phone sometime this summer. Just don't know which one yet