Agree. The deploying cost of IPv6 is quite expensive. I started to work on IPv6 and IPv6 transition since 2001. By that time, we optimistically thinkIPv6 could replace IPv4 in 2 or 3 years giving its maturity of basicprotocols and massive advantages. Now, I have to say that we underestimated the deploying cost, a lot. One more thing to be mentioned, IPv6 provides a lot transition approaches to support IPv4/IPv6 coexist. So far, I have not seen such efforts in HIP or Node ID. (I may volunteer to do so.) And in order to obtain the biggest benefit of HIP or Node ID, globally deployment is requested. Therefore, transition solutions may not solve the problems.
One could consider doing a combination of adding a new namespace and deploying IPv6. If the cost of deployment is too great for putting IPv6 on hosts, then use IPv4 in hosts as the EID namespace and IPv6 deployed in the core as the locator namespace.
If it is easier or more necessary to run IPv6 in the hosts, then the opposite could occur. In fact this later case is probably more necessary so we can have a larger address space that addresses all the hosts in the Internet with IPv6 EIDs and use locators as IPv4 addresses with an IPv4-only core substrate.
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