There is an important difference between v4 and v6 - we've already paid the
(by now massive) deployment costs of v4.
there is another important difference between v4 and v6 - we don't have
enough addresses for everyone to use v4.
It would be nice if going through the immense upheaval and cost of deploying
6 (or whatever our next big step is) actually got us a solution to one of
our most pressing real problems.
yes, it would. but that has to be balanced against the cost of
second-system effect.
Keith