Board Thread:General Discussion/@comment-13892511-20140412070421/@comment-366087-20140412072034

Staff generally will not remove bureaucrat rights from inactive members. It would take a community consensus to get them to act on it.

You'd have to have a forum discussion open for at least 7 days, then pass the link with the request to Special:Contact. Courtesy would have you message the b'crats as well advising them of the discussion, especially if they are still active elsewhere on Wikia (UserList's "last login" column) although that is optional. Still, by messaging them you can also ask them if they wish to remove their own rights.