If you focus the issue on non-profits and edu orgs, all the people trying to get this through will do is write a tiny little exclusion just for that concern (ie no slow lanes for non-profits). That's what they do every time there's a narrow concern raised against terrible legislation.
First, you have the posture wrong. If there's no "terrible legislation" then Comcast and TWC can do whatever they want. What you're asking for is "terrible legislation" to keep them from doing whatever they want.
Second, at least to me, the non-profits and .edu orgs are the ones that implicate the most substantial public interest concerns. I don't really care about Netflix's profit margin.
It'll backfire big time, and waste valuable time.