Masataka,
The reality, instead, is that actual networks running IPv4 and IPv6
***CAN'T*** deal with renumbering, because of their inertia.
While I obviously have sympathy for the sentiment, I think your
statement is too strong. I believe it would be better to say that end
users have an economic incentive to avoid having to renumber, and most
are able to make use of RFC 1918 / ULAs and NAT with attendant
consequences to avoid the effort involved.
Still, I would argue strongly for inclusion of a fuller discussion about
technologies that obviate the need to renumber.
Eliot
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