These companies already have fine print that the advertised speed is not a guarantee. My point in this thread is this policy takes away a tool ISPs had to control traffic in their networks, which I believe will lead to higher costs.
it's not a double-dip. if a single service is behind load problems and causing general service degradation, I think it is fair to throttle that service.
If netflix traffic is straining ISPs to the point of requiring hardware upgrades etc., I think it is fair for ISPs to ask them to pay some of that cost.