As for the Pope's health, one concern that I have had for some time is that he will slip into a comatose state without any written directives concerning life support or papal duties. As you said, much of the administrative functions have long been handled by others; however, there are still documents that require the Pope's signature and an incapacity could make things complicated.
That's been one of my concerns, too. However, I suppose (grudging admission) that God has His plans, too, so we'll just have to see how this works out.