IPv6 support on Virgin media

Yea, I guess your correct about users having the same fixed IP now, perhaps that's a bit of a win some loose some sort of thing.  I would imagine that once IPv6 is standard then obfuscation through IP rotation will become standard.  Time will tell on that.

And User to User transmissions need not be high bandwidth, As it stands how 15 meg can push through 4k HDR without any issues, so even if users are opting for video streaming I don't think that would be a issue.  Honestly when I say User to User hosting I am meaning other things like file sharing (Family Photos, Documents, that ilk), Voice and Video chat facilities, Playing games, home security, cans of bean inventory from the tracker in the kitchen.  Not everyone wants to pirate Movies all day long ;P.  I could see tor/darkweb services enjoying IPv6 a little, but probably not enough for it to even think about (not a fan personally).

Users looking to stream to multiple people/places have better options too - ones that support multicast.

One of the Bigger problems for ISP's would be User to User VPN's to get around GeoLocation.  Once that Ipv4 NAT layer is removed, then routers should be able to cope a lot better with a high concurrent connection, It could (but probably won't) help bring down some of those GeoLocation walls we have.