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E, Danielthat sometime in the next 5 years, one or all of the grading companies will introduce computer software assisted grading that will completely recalibrate the grading system. I'm predicting a 1-100 point scale, perhaps broken up into 5 catagories instead of 4, that will rely on a scanned image of the card to undergo minute and exacting examination, one that will put to bed the notion of which grader looked at the card and what side of the bed they got up on.
Then, slowly all cards graded under the old systems will be encouraged to be re-graded because of greater prices achieved under the new flip/slab combinations.
That takes care of the next 25 years I would think. 
Daniel