This doesn't make sense. Why would the ISP's want to throttle the websites that their customers are using? Even with the lack of ISP competition, pissing off your users that much seems like a bad strategy. And they can already throttle users based on bandwidth used, how would eliminating net neutrality help them achieve this goal.
I predict the ISP's selling a default throttled connection to everything, and then for $10 more you can unthrottle Netflix or YouTube. Competitors would need to convince ISPs to allow unthrottled access to even have a chance.