I think Tim Cook is fine, but I hope sometime in the future that Ive will be a part of launches. Why not? He's the guy designing the stuff and he's usually in the launch videos. Why not put him up there to at least reveal the new hardware? Scott Foresthall (sp?) is another good one--he is just as passionate about the product as Steve Jobs was.
Tim Cook should be up there as the numbers guy because he's the CEO and he's running the ship. But he should be up there for a minimal amount of time. Let the guys making the products present the products.