It appears that Owen DeLong via NANOG <owen@delong.com> said:
The cost of putting flyers in the bills rounds to zero, so yes, really. I expect these companies all have plans to support v6 eventually, someday, once they're retired and replaced all of the old junk that handles v6 poorly or not at all, but you know about accountants and depreciation.
Unless their infrastructure runs significantly on hardware and software pre-2004 (unlikely), so does the cost of adding IPv6 to their content servers. Especially if they’re using a CDN such as Akamai.
I wasn't talking about switches and routers. I was talking about every single piece of software and equipment that they use for support and marketing and customer service and all the other stuff that big companies do. As I may have said once or twice, eventuallly it'll all be replaced so it works on IPv6 but we're not holding our breath. R's, John