Netflix / Youtube cost ISPs little compared to BitTorrent.
http://www.neoseeker.com/news/15151-netflix-popularity-excee...
A factor that adds to the impact of the streaming services is their use being more concentrated around the already high traffic peak viewing periods.
It is more than a little absurd that ISPs complain about users actually using what they're paying for. The days of people paying for broadband and using little more than email, chat, and simple web pages are over. And many of those that have consumed video online for some time are now understandably needing more bandwidth for higher quality now.
The situation with mobile is where many will be getting upset. Networks are being billed as fast and offering all sorts of video, but many consumers face plans limiting them to no more data in a month than most could get with low-end home broadband plans in a day. Of course there are good reasons why massive numbers of people can't be heavily consuming video at once on mobile networks, but the providers are not very up front about it.
The majority of immediate BT traffic is downstream too, it just has a very long tail of upstream. It can take months to get a 1:1 ratio on a download that occurred over an hour or less sometimes.
I think providers are just going to have to come to terms with the fact that consumers are demanding good access now instead of the crap they've been getting. We need reasonable speeds up and down, reasonable bandwidth limitations, and reasonably-priced solutions.