One half of Apple is execution. I believe that Jobs has infused the company with a culture based on his favored principles, and it's reasonable to think this culture is sticky.
The other half of Apple is big strategic decisions. Do the iPod. Do the iPhone. Do the iPad. I don't know anyone else with a track record like that. I don't know that it's trainable. Until the next smash product line that's not from his lips to Apple's ears, I don't know that Apple is going to be fine.