Yeah, offensively, Yao is all about getting position. If he gets the ball, in places he like, a combination of our guards getting him the ball, but moreso, him trying to effectively fight the front, Yao, pre-surgery, or post-surgery will have the touch to score in the post. He'll still be a good FT shooter, and will likely be one of the top centers because of the lack of competition.
What I worry about is his stamina and speed. We've seen how much fronting literally takes him out of the game. With a reduction in his speed, that task will be even harder. If that's the case, then Yao would probably have to adjust his game more to the high post, something he's shown he's not too comfortable with. But if he can do that, as he DOES possess the skill set, then Yao will still be a very effective NBA player.
But he has to remain healthy, that's the biggest thing. He's missed 89 games prior to coming into this season since 04-05. And that's not including him missing the playoff games against the Lakers, or Jazz etc. You count that, and that's 10 more games, and 82 more this season, that's 181 games missed the past five seasons. That's the main concern, he's been the most injury prone star player the past half decade, and McGrady is right there with him.

But yeah, I'm not all so worried about what Yao will produce. Ultimately his skill set would make him a productive player, but if it's he can remain healthy, something he's proved he cannot do, and is now coming off his most extensive surgery.