I beg to differ. I know several ISPs that have been quietly putting quite a bit of engineering resource behind IPv6. The public announcement of residential IPv6 trials by Comcast was not the beginning of a serious commitment to IPv6 by Comcast, but, rather more towards the middle. Comcast has had substantial engineering resources on IPv6 for several years now.
None of my transit providers currently offer native ipv6 where we are located. One recent vendor said they could tunnel 6 over 4 but any network address blocks assigned to that network would change at some point in the future. In other words, we could do v6 over 4 now but we would have to renumber later. What I heard at a recent (within the past six months) conference was that "there is no customer demand for v6" so it isn't on the immediate needs list. He said they had a lot of inquiries about v6, but to date not having native v6 wasn't a deal breaker with anyone. So my instincts tell me that until not being native v6 capable IS a deal breaker with potential clients, it isn't really going to go on the front burner. Many companies operate on the "it isn't a problem until it is a problem" model. George