If, some ISP, say, "Bombcast", decides to throttle some website, say "Slacker News" as part of an extortion plan, can't we have every other content-providing internet service - be it Wikipedia, reddit, AirBnB, Facebook, maybe even google, if they're on this side of the fight - throttle all of Bombcast's customers right back.
Suddenly half of Bombcast's customers find their favourite sites moving at unacceptable speeds, with a black border around the edges and an annoying black popup window telling them exactly why their website access is being throttled, and recommending they switch to some less heinous ISP instead. Naturally, hit the FCC, any part of the US legislature that voted against Net Neutrality and so forth into the bargain. Force customers to choose between the faceless drones who laid the cable to their door ten years ago and send them a bill every month, or the guys who provide all the shiny internet stuffs that they enjoy for more or less free.
Might some sort of content provider's union be quite powerful? Because of who they are, they have a head start at winning hearts and minds so they'd have leeway when it comes to taking action that might alienate their public.