That's a bit short-sighted, don't you think? Do you similarly think we shouldn't attempt to preserve the works of Beethoven or Picasso? There may not be a great cosmic truth contained in many different works of art but that doesn't mean there isn't irreplaceable creative value in it.
That's not to say that every game was noteworthy, but there are some that are worthy of preservation, not because of nostalgia but because they have value inof themselves.