hmmm, lets see what I have, just in my little old house:
Windows: 1 XP box, updates weekly, no IPv6
MACOSX: 3 Macs, updates weekly, dual stack
Linux: 1 Ubuntu Server, updates weekly, dual stack
Apple Airport 2 (G+N), IPV6, Updates ~monthly
NAS 1 ReadyNAS with some embedded OS (probably Linux), updates
yearly, no IPv6
IP phone 1 Cisco 7960, updates essentially never, no IPv6
Cisco router 1 871 VPN router, no IPv6 on image I run, updates about
every 6 months
Cisco switch 1 CAT3650 router/switch, no IPv6 on image I run,
updates yearly
Linksys WRT 1 Home router, no IPv6, updates never
Tivos 3 no IPv6, some embedded OS, updates ~ each 6 months
Squeezebox 1 no IPv6, updates never
MoCA ECBS 3 NO IPV6, Updates ???
HP printers 2 no IPv6, updates never
So I can imagine it being reasonable to handle host changes on about
half of these. At best. And certainly not with a flag day just
inside my little orandom.net domain.