Maybe I'm missing something, but I still don't see how the argument applies. Sure, if Comcast were shaking down Netflix, I could see how that would be a reasonable line of discussion, but they're not... they're shaking down a Tier 1. Level 3 is surely incurring the cost of the vast majority of the long-haul bandwidth, since, well, they're bloody Level 3.
Combine this with Comcast's profit statements, the rate at which their internet access products are growing in both subscribers and revenue per subscriber, their actual or near monopoly status in virtually all of their service area and, perhaps worst, the obvious fact that they offer competing services. That makes a nice recipe for this-is-just-greed, and it's really horrifying.