I think Rafa is a very talented, but one dimentional player. He has the physical build to pull it off especially on clay (which his game is totally made for). However, the same game that makes him dominate on clay severly hampers his hard court game. He does not have the time to take those big swings on hard court, which is why a lot of his forehands land short.
The other clay court problem is the soccer attitude of running everything down. This is the main reason why he gets so many injuries on hard courts. Hard courts do not cushion the body like clay and Rafa is not really light on his feet.
He has improved his serve speed, but he is not making the high percentage of first or second serves. He has improved his backhand, but makes more errors. Can Rafa make all of the necessary changes to his clay court game and maintain his clay court dominance, while gaining in his hard court game??? That is a big demand to complete while trying to keep the #2 ranking.
Add to that, he will have to face playes like Blake, Berdych, Youzny, Murray and a number of other upcoming players who have figured him out and looking to take his scalp. All which will make it harder for Rafa to maintain his level and health on hard and clay courts.
Only time will tell now.
TennezSport