I think that "study" is a load of crap paid for by opponents of net-neutrality who need a reason to charge different prices for different types of content.
In other words, I think it's bunk.
And, of course, while they mention how much the telcos would need to fix this "problem", they don't mention how much they are currently spending out of their inordinately large revenues to do so. But then, why actually use the money that people are paying you for bandwidth to support their connections when you can just throttle BitTorrent?