I remember what happened to Apple the last time Jobs left to do other things. What other things? Pixar, which succeeded, and NeXT computers which mostly didn't.
Anyway, in the absence of Steve Jobs, Apple didn't do much. It began to really take off when he returned.
Ask yourself what you believe would have happened to Apple if Jobs had not returned? Now ask yourself if this time around he has built into Apple a mechanism to replace his unique input? I'm inclined to doubt it; I hope I'm wrong.