He's a great designer but how is he at reading the pulse of the consumer
and running an organization while placating the Board and the stockholders? Anyone will have some "big shoes to fill", a "tough act to follow", a "hard row to hoe", etc.. Please follow this link for additional clichés!
After all, Steve came to Apple with years and years of experience and talent, ... Oh wait, that was Mr. Sculley... But Steve di go out and take a 'refresher course' in business management!