An item you forget to mention is that there have been numerous new SE groups generated including:
DBA SE group
UBUNTU SE group
UNIX&Linux SE group
SuperUser SE group
StackOverflow SE group
Security SE group
Webmasters SE group
Apple SE group
In the past there were only a couple of UNIX/Linux based SE areas....now there are many so I believe we are all honing in on the specific purpose of ServerFault and attempting to differentiate this group from the other SEs.