I think he might do better on clay this year but RG is pushing it a bit, it would be nice for him to win some clay titles before he retires, preferably masters but RG is off most peoples radars not just Andy's due to a certain Spaniard.
He is a hell of a mountain to climb over, it would need a major upset like 2009 for anybody to win it.
Maybe that certain Spaniard's knees might start playing up again.
Seriously though, if Soderling, who was effectively a clay court nobody ranked #25 at the time managed to cause an upset, then why not Andy? True Nadal beat him in three close sets in the SF in 2011, but Andy has come a long way since then, both physically and mentally.