Really, I thought at first it was a pure attack against Piracy, and in theory it's a great one. When someone is downloading a lot in their month like 200GB Comcast might rise suspcious and say "What's the downloading, OH! All these movies and stuff. Well..we should report that". But in the blog you posted, I also saw. The argument that Internet Television is very popular and it is. I personally enjoy watching reruns of House M.D. and The Simpson on FOX On-Demand. I'm sure others have sites they favor for their internet TV needs. So, that could be hurting them a bit as well.
It doesn't matter, because I'm going to keep Cable for a month to see how I fare with downloading and see how much of it I use. If the cap becomes a problem then I'm switching to DSL.