Is Apple weaning its shareholders from a perceived reliance on Jobs?

The question I have is whether this most recent leave of absence is a calculated move on Apple's part to draw attention away from Jobs and towards Tim Cook, who is widely regarded to be Jobs's future successor. Cook took over daily operations two years ago when Jobs was on leave - that lasted for 6 months. And while there is every possibility that Jobs will be back at work in a few weeks or months, some have speculated the wording of this most recent announcement suggests it may last a year or more.