Move to ipv6 already
One complaint that I have about ipv6 and mac addresses is that they use hex separated by colons. Not only is it way longer than an ipv4 address, you can't rattle one off using a number pad. Back when I did full time IT, that sounds like a nightmare if in ipv6 land you have to enter addresses as commonly as you have to enter ipv4 addresses.
I don't type in many IPv6 addresses anymore, so this doesn't see much use anymore. It does make a great desk nicknack, though!