Alright everyone, take a step back and assess the situation: No one is going to switch to a "pay-per-gigabyte" service plan. They're not going to switch, because they know classes would revolt and world governments would be overturned, and gamma rays would burst. Forcing this down our throats would kill them and their industry. Internet growth would not only hit a standstill but regress.
On top of that, people really underestimate consumer demand. Come on people, have some faith in capitalism. The internet is the least regulated industry in the world (short of noodling), and because of that it is also the fastest growing. How come we've suddenly run into a time in which it all needs regulation even though it's still running as smoothly as ever? Oh wait, we don't. And we don't, because if all the major companies went to pay-as-you-go, one company would spring from no where offering a monthly plan. Even if that monthly plan was 3 times what we were paying before, everyone would flock to it, AT&T wouldn't be making a dime off of their mult-billion-dollar infrastructure, and they would be forced to go back into the monthly game, and competition would once again commence.
This is nothing short of scare tactic to get people to buy more cable internet and reduce their use of the internet. A scare tactic, nothing more.
Free market is totally flawless. It will fix itself, given the opportunity.