Lack of IPv6 support in some LB products has nothing to do with orthodox beliefs in purity of NAT-less IPv6 world and all to do with the vendors' decisions to cut hardware costs by supporting only 32-bit addresses in their hardware implementation (if you have a software-only LB that still doesn't support IPv6 today, please let me know ;). And of course some of us were stupid enough (or trusting the vendor, which is the same thing) not to check whether the appliance we bought a few years ago will ever support IPv6. Ivan
Getting more and more off-topic, but regardless of what purists might think, load balancing is a crucial function (until TCP stack and/or socket API get fixed - read: not likely) and at least some of them do and will use some sort of NAT to do their job.
I think this is the key point. While providers are not putting up content on IPv6 for this reason, it is an issue.
Tim