Well I haven't seen him in that many games this year, and maybe you have, but come on the guy is having yet another career year stats-wise. The only question in my mind, as others have pointed out, is what will he want to do when his contract is up in 2009? Let's see, he'll be 33 then, man I can see him making someone an instant championship contender.
KG is not a post player, that's a major difference between him and Duncan. In a way, KG's rebounding numbers mask him as a SF. If you take away his rebounding numbers, KG is an all-star SF but not a super star. His presence on the court can not be felt as much as Duncan or even Kobe. Therefore, KG needs another all-star to help him and the team needs post presence. Right now, they have none. Even last year, Wolves would be hard pressed to beat the Rox.