I think this whole discussion is bizarre. Most people in developed nations don't just drop dead out of a clear blue sky. The only thing I know of that can cause that is a brain aneurysm. There are probably a few other things, but they're pretty rare.
I haven't been following this at all but I just did some Googling. I think he was diagnosed with cancer in April. Mid-April to mid-November is not long at all, in this day and age. Many people suffer much longer. My grandmother had ovarian cancer, and underwent chemo and surgeries for three years before it finally killed her. My grandfather was in treatment for heart disease for close to 10 (I think) before he died of a heart attack.
He lived quite a long time and died relatively quickly for somebody in this society. I don't see what the issue is.
Then again, I've never believed that we consciously choose when we die. Did Abraham ever say that? I don't remember hearing it.