I think a major piece of what makes Rafa such an all-time great is that he beat on Roger just when many people were in agreement on the view that Roger was THE all-time greatest, and also because Rafa has been the greatest clay courter ever. So, if Novak won all four slams this year AND had to beat Rafa at RG in doing so, then, yes, Novak might jump over Rafa in the rankings of all-time greats in many peoples' minds. Not the least of which reasons being that Rafa played a game than many purists seem to regard as extremely high-powered junkballing, and this hasn't sat very well with them because it sort of represents the realization of a logical extreme in the game's evolution that was predicted by many when high powered rackets and polys were becoming fashionable and these people were crying foul that too much of the finesse and the skill was being removed from the game and it no longer rewarded certain "good" technique as much as it did brute force. So, the purists would be prejudiced in that sense; but at the same time, if Novak wins four slams this year, not only would that bring his slam count to 10 which is not so far behind Rafa's 12, but also he would have one-upped his 2011 campaign and that alone was astounding enough.