Big Boo Hoo
So a major protocol switches from using TCP to UDP (which, actually, has nothing to do with bulk transfers, but more to do with connection-oriented or not - ask GhostCast who use multicast UDP or TCP to splat gigabytes of disk-image data to PC's across networks, while there are TCP and UDP ways of doing everything from VPN to DNS).
So, being UDP, the *amount* of traffic is actually technically slightly less (if this "BitTorrent does it's own connection management" thing is true) because you don't have as many layers of packet protocols involved. What's changed is that instead of having connections which *SHOULD* be reliable, they are now not needed to be reliable. In terms of the actual data going across the big networks, this makes no difference at all, because TCP is just *a* connection management style and Bittorrent happens to use a different one. If you drop or slow 50% of them (which you are perfectly able to do), all you do is create more problems for everything from retransmits etc... TCP = UDP with knobs on, basically, and most UDP users just recreate those knobs in different ways or don't need them at all.
What's changed is that people's incorrect "expectation" that UDP means "quick, small, unreliable packets" now becomes "lots of quick, small, unreliable packets". The only things this interferes with are ISP's "magic boxes" which determine the contents of a packet but to be honest, if you're doing it that way, it was bound to come to an end eventually - hence the use of encrypted torrents, Tor tunnels, etc. You cannot *ever* rely on being able to detect the protocol in use within a given packet. It's a layer violation and it's just plain stupid, because anything "naughty" will evade you at the first opportunity and anything "not naughty" will attract derision if you affect it in any way.
Yes, BitTorrent is an enormous pain in the backside because it takes a disproportionally large amount of traffic. But it's like saying that we won't let people use the radio waves for TV because TV takes up too much of our radio spectrum - it's so large because people are transferring larger files and there are more of them doing it, in the same way that TV takes more bandwidth and more people watch than listen to the radio. However, my ISP has been complaining more about iPlayer, which takes up MORE bandwidth than Bittorrent through their (major ISP, connected to BT) networks. I wonder what iPlayer uses, TCP or UDP? I don't know to be honest, but I don't care. All anyone cares about is that they can transfer X Megabytes of data from the BBC to themselves fast enough that the video doesn't jerk.
It's up to the ISP's to do one of two things - ban use of certain protocols in their terms and conditions and enforce them by whatever means they see fit or leave things alone/increase prices across the board and stop looking for sympathy for their heavily over-subscribed pathetic data lines.
They can threaten what they want but a price rise would actually mean they would have to stop over-subscribing and would lose customers. Banning/throttling certain protocols will only affect those people who don't use / don't know about them, who aren't you're primary concern anyway, you will lose lots of customers and it will cause technical support problems of enormous magnitude (Steam uses Bittorrent to download its games if I remember correctly - they even hired its main author).
A blanket throttle on each user is the only real answer but technically it's just easier to count the bytes going through and charge for the excess than to try to limit each connection with some sort of QoS. So, who's going to be the first ISP to go down that route? Wanna lose a thousand customers today? No?
And, as always, we are brought a step closer to using ISP's as just that - service providers - they give us the tube and we use it. If it means we have to encrypt, tunnel, obscure everything to stop them fiddling with it, that's what will happen. Eventually, the Internet will no longer be anything more than a base layer because everybody starts using P2P layers on top (like Tor, Freenet, etc.) and the ISP's and governments become locked out of every bit of access they had to what people were actually doing on the Internet. Then, given that everything's *completely* anonymous and encrypted, setting up small mesh networks becomes less legally liable and joining them together re-invents the Internet as what it started out - a collection of random people deciding to exchange any traffic they need to.
You don't buy an Internet connection, you join the local neighbourhood mesh where one techie has been paid by the council to fire a microwave connection into the next town and somewhere along the way, your traffic is passing through your neighbours, a local techie, some bright spark who figured out a way to transmit wireless traffic to his friend over the Channel, to Europe, Asia, etc. Government regulation goes out of the window, everybody gets "free" Internet and the ISP's go out of business.
No filtering, no monitoring, no control, totally anonymous, immune to censorship (Great Firewall of China etc.), saves people money, puts AOL out of business, gives blanket coverage, zero-cost entry (get an old USB wireless dongle second-hand), grows exponentially, takes advantage of new technology quicker (everybody who upgrades from 802.11g to 802.11n makes everyone else work that little bit faster), cuts BT etc. out of the market on data lines, and means that people start securing their damn protocols.
I'm in Essex, who wants to start it?