Re: Obvious need for..
"If replacing IPv4 devices is inevitable one might as well go the whole hog and fix a list of issues beyond lack of addresses."
It was exactly this thinking that introduces so much friction to changing to IPv6. If they hadn't gone whole-hog all at once, then everyone would have already made the change. In terms of encouraging adoption, it's better to have a series of relatively small changes over a single ginormous change.