OK, but this doesn't have any effect on your "Listen", "NameVirtualHost" and "<VirtualHost>" statements of your httpd.conf, "ListenAddress" in sshd.conf, "Bind" in proftpd.conf, "*-source" and "listen-on*" in named.conf, [...]
True. However, in all of the cases above except named.conf, names are a perfectly valid substitute for the IP address.
Not to forget all the IP address based ACLs.
I suspect that eventually, we will discover that ADDRESS-based ACLs simply do not scale to a V6 world, and, you will see support for other strategies, such as host-name based ACLs.
Given that a server often has to know it's exact IP address very often (especially if it has multiple IP addresses associated with it's public interface), it's not a real relief compared to the other struggles you have when subnet changes.
In most of those instances, the server can get it's address from a nameservice, and, only really needs to know the unique name for the correct address. Owen