It does make you wonder... with the extra responsibility associated with having an admin account, there should be some expectation of a certain level of activity. There are certainly guidelines for the amount of activity that should have occured before an RFA, so why aren't there any for an expected level of activity once adminship is granted?
A de-sysoping for failure to meet this level probably shouldn't be automatic, but I wouldn't have any issue with there being an automatic "call for review" based on it... Angela