My
New York Chat site has just me as the admin, and two active super moderators.
My old site had many more super mods and regular moderators, but I was using it as a promotion type in an attempt to reward active members.
In the end that ended up causing a lot of problems.
I think what I learned from that is if I have a big site again that needs more active moderators, set a policy up front that mod positions will be reviewed every 6 months. If you are no longer active and/or generally not a positive influence on the site the spot will go to another member if a better candidate exists.
Think of it more like regular elections than a lifetime appointment.
-Raymond