Regarding the IP address privacy stuff...this can already be a problem with IPv4. At home, Comcast gives me IPv4 DHCP leases that get renewed to the same addres

Regarding the IP address privacy stuff...this can already be a problem with IPv4. At home, Comcast gives me IPv4 DHCP leases that get renewed to the same address for many months at a time. At work I (and most other employees) have a static IPv4 address. There is no way with IPv4 to do something like RFC3041 IPv6 random host addressing.