"For my crackpot claim I need only look to his note on Revelations 1:20 in which he declares that the letters to the seven churches really mean seven coming ages of church history"
Scoffield is not alone in this reasoning, as the church ages do seem line up with church history.
http://www.google.com/search?q=seven+churches+in+revelation+seven+church+ages&start=0&ie=utf-8&oe=utf-8&client=firefox-a&rls=org.mozilla:en-US:official
In fact, several of the links quote Scofield's note verbatim.
It's a purely self-referential argument.
Your link reinforces my point: that the equation of the seven churches with seven ages of history is a figment of Scofield's imagination and is not substantiated by the Scriptural passage he is commenting at all - in any way.