You've been reading the Race thread.
Totally agree. But, as I said in my thread, he could really do with winning that elusive first Slam, otherwise he will be a male version of Wozniacki, Safina etc.
He was also talking of playing Basel or Valencia, so that could considerably boost his chances of actually finishing the year as the world #2.
He'd need Nadal to fall relatively early in Paris (possible if the surface plays as fast as last year), and probably to fall in the group stages of WTF. Also possible, but less likely.