The concern I have with the transition when Steve finally does leave is that no one at Apple has the "I don't care what you think" attitude required to force the rank and file to the level they operate at now. I fear that once Steve is gone, Apple will become a "good enough" company. Hopefully, Tim Cook will be up to the task, but I am not optimistic about it.
The real question (for me at least) is whether or not that change in responsibility is a valid defense of the drastic pay difference between the two jobs. I kind of doubt it.