Hrmmm,..
I have a great deal of respect for Mr. Iwata - he is not your standard figurehead, nor a serial CEO who spews sales figures and industry double-speak - he is first and foremost a software engineer and a gamer, and is truly a humble man. You do not hear much about Iwata, short of the many editorialized *cough* 'articles' that might cover any perceived missteps attributed to the company (and subsequently his leadership) that are and will continue to be more than well publicized by the media.
He does not take any credit when it is certainly merited, and attempts to deflect criticism of his teams onto himself, and bear the burden of any struggle the company might be facing onto his shoulders. He is a strong, quiet leader, and again, very humble - traits that are ever increasingly rare in this industry, and furthermore in this world for that matter.
All that said, the stress that Iwata must be facing on every front is very real, and must be quite palpable. I hope he takes the time to seriously weigh the pros and cons of his position, and how it might be affecting his life, particularly when it comes to his health.
As much as I would love for him to stay on indefinitely at Nintendo, I would never want for him to do so at the cost of his well-being.
Feel better, Mr. Iwata.