I don't know how Netflix figures out that it's Verizon that's slow, but lets say it's with some software that anyone could use. Wouldn't it benefit the entire Internet to open source that software so that anyone could use it? Or, barring that, provide an API that anyone can query.

This way, any company can use the software and report the same thing to their customers. Lower the barrier to entry for Amazon/Google/Hulu/your startup to join the fight and inform the people.