While this will generate tons of rumors and cause a big stock drop, I have faith in Apple’s upper management that they could continue doing well without Steve Jobs. And that’s true whether he’s away for 6 months or forever.
I’d actually be curious to see how the company did with someone else leading it.
There’s risk, for sure. He has impeccably good taste and is enough of an asshole with enough authority to make sure his company produces products that reflect his taste. But I think he has instilled his values in enough other authoritative people at Apple that his good legacy may continue after he’s no longer the CEO.