[neojima]

In 2005 or so, sure. Now...not so much?

What privacy erosion/easier tracking are you talking about that wasn't remedied by the very wide deployment of RFC4941 (IPv6 Privacy Extensions) in operating systems?

[singularity2001]

with IPv4 my ISP has to shuffle IPs with every reconnect. with IPv6 you could get one IP for lifetime?

[detaro]

That's orthogonal to IPv4 and IPv6. There's ISPs that give you always the same IPv4 adress, there's ISPs that give you a different IPv6 prefix each time.