When Apple parted ways with Steve in the 80s, they did so because they changed the direction of the company and disagreed with his leadership vision. This time, it's the complete opposite and he will be remembered forever at the company in a positive light. This isn't an appropriate comparison since the situations of Steve leaving were completely different.
Except in rare cases creative genius does not transmit well from individual to individual. It needs the appropriate level of talent and a shared vision. Thus far I see no evidence of such a transition. The level of performance could just as easily have come from an apple-centric version of 'Eliza'. Scripted and performed by actors uncomfortable with their lines...
Well, Steve Jobs didn't care about Apple being his legacy, so he left the administrators in charge and did not build up a successor (maybe out of choice, maybe lack of choice, maybe lack of time). He created his own legacy.
The evidence we have (his grooming of the executive team, his appointment of Cook, the existence of Apple University [http://articles.latimes.com/2011/oct/06/business/la-fi-apple...], etc) seems to say otherwise. Apple's continued success after his death appears to have been extremely important to him.