General Studies: Brilliant Strategy or Dumb Idea?

For schools which offer the great books curriculums, eg St. John’s, TAC, etc, how effectively can students incorporate more modern theories or critiques of the ideas of the writers they study? I know that many of my older professors admit how hard it is to reject essentially disproven theories from their mental framework, and these are the same people who have spent their whole lives studying one subject. Do Johnnies and the ilk run into the same conundrum when faced with say modern physics or different methods of textual criticism?