I disagree. Imagine I'm an evil ISP: If I was to throttle HTTP to a certain limit, I'm sure I could break Youtube (and other video sites) without breaking the rest of the Web. And if they switch to some non-HTTP protocol, I'll just throttle that protocol across the board. In all cases, I'm treating hosts equally.
Alternatively, if I prioritize some hypothetical Netflix-specific protocol, that will inhibit competitors from entering that market unless they can and do use the same protocol as Netflix, which might not be the best solution in a world without such prioritization.