[kbyers]

Yes, they definitely should have used 64-bits instead of 128-bits for the IPv6 address. At 64-bits, you have over 2 billion addresses per person on earth. At 128-bits, the number of addresses, you have is close to incomprehensible.

You don't need the host component of the IPv6 address to be 64-bits in length.

Also, they made the network component unnecessarily long in order to improve summarization. But until you solve the multi-homing problem summarization won't work.