While you make the point of the model, you didn't specify your stance on the topic.
I for one am against the capping. I can understand the business need as additional content becomes available, it requires additional bandwidth available on the part of the ISP.
I currently subscribe to a 'premium' tier from TW here in Milwaukee, mostly for the additional upstream bandwidth. I did a quick review of my usage as tracked through Cacti, and found that on average, I use about 40GB/mo. An occasional torrent for a distro, plus some updates to windows boxes, and a couple of Gentoo boxes. I also have begun using Netflix's online video more.
What is interesting though, is that I haven't read anything mentioning the HBO on Broadband service that is bundled with HBO package I currently have. Will I be charged for bandwidth that is used for a service I'm already paying for (to the same vendor?)
Just some thoughts. I hope this whole tiered thing falls through...