My concern is less with Job's health as such. Rather I'm concerned he'll get bored. He's done it. He showed everyone that he's awesome. He's overcome his forced exit from Apple and shown the world his magic. So what now.
The question is: does it feel that way to Jobs?
I agree, that he does not like to be bored. But what seems to have been his 'fix' in the past for being bored is... revolutionizing some corner of techdom. Seems to me it's only a matter of whether he comes up with a materializable dream to tackle.