the fact that IPv* doesn't distinguish between who and where does
cause some problems, but does not significantly impact the ability
to route IPv* packets. even if you free IP addresses from any kind
of role as host identity (which IMHO would be a good thing except that
nobody has produced a satisfactory solution to the problem of mapping
between the two), IP addresses will still need to be fairly stable,
and there will still be a nontrivial amount of effort associated
with renumbering as the network topology changes.
Keith