While I enjoyed the article, I must say this hyperbole (I've read it elsewhere too) about 'if he loses his legacy is in doubt' is sheer nonsense. The man has made 20 straight Grand Slam Semi-Finals in a row. IN A ROW. It's simply unparalleled. 19 Finals. 13 Wins. If that ain't a legacy, I don't know what is.
And his record on clay is exceptional - only one man, Nadal, has been better over the last 5 years. And Fed beat him, on clay, in Madrid last month.
I don't disagree about the rest of the field moving closer to him - he is 27, the only top 5 player over 23, and has lost a step. But to question his legacy because he hasn't won the French (merely made 4 finals in a row) would be like questioning Borg's legacy, who was ever stymied at the US Open, or Sampras, who made the French Semis only once.