I think Level 3 should straight up shut off their peering agreement with comcast and watch how all the last mile customers blame comcast for the issue, until such time as comcast stops playing games.
If you get to set the narrative such that one side or the other as the only ones who gain from the interconnection, this becomes trivial, but the hard facts are that both sides want the interconnection, but to try as hard to pretend that the other side is the more desperate one in the deal.
They do now that a deal has been worked out:
http://www.washingtonpost.com/blogs/the-switch/wp/2014/02/23...
Not if they're watching Netflix. As I read the deal, Comcast and Netflix will be directly connected, so if you're a Comcast customer watching Netflix, your packets only traverse Comcast's and Netflix's networks; no third parties are involved.