It's interesting to see this looks like it was drafted by a Time Warner Cable employee, and yet my twc internet still doesn't support IPv6. Though it gives me hope that maybe it's coming soon?
http://www.timewarnercable.com/en/support/faqs/faqs-internet...
Before you suggest DDNS, for some companies, the length of unavailability between a changed IP and the DDNS client noticing and updating can be fatal.