My provider (Suddenlink) support rep responded to my question about IPv6 support with "No, we do not support it since almost no one uses it currently." S
Perhaps you can point them to sites like http://www.worldipv6launch.org/measurements/ and show them some of the stats on networks that are using it. You can also point them to the fact that Facebook, Netflix, Wikipedia and all of Google's sites are available over IPv6. So the "almost no one uses it" doesn't quite fly.
