The reason people ripple at the thought of someone remaking a Hitchcock film is the same reason there is only on Mona Lisa.  The belief is the results can only be a replication, not an improvement.  An argument can be made, however, that if Andy Warhol or Monet had reimagined the Mona Lisa, it could be just as strong a piece of art as DiVinci's masterwork.  This is the hope of a film being remade by an auteur.  In my opinion, David Fincher could accomplish just this with his purposed remake of Strangers on a Train...