As a Londoner who recently got a 1Gbps up/down connection, I can't wait for this; the limiting factor in saturating my connection is now the rest of the 'net, rather than my own connection — which is actually oddly frustrating. Catch up already!
The reason why increased Bittorrent traffic is that the Bittorrent protocol doesn't require any specific selection of peers. This means that you can have excessive traffic from other areas, which plays havoc with Tier 1 ISP peer agreements. If the protocol isn't modified to work in conjunction with peering, I would expect ISPs to simply kill Bittorrent traffic.
[1] http://aqualab.cs.northwestern.edu/projects/118-ono-reducing...
There aren't many online services that can chuck >100Mbps at a single user.