You are correct that there are many very brilliant people working for Apple. However to diminish the value of Steve Jobs is simply naive. The reason Apple exists then and now and the reason Apple is admired world-wide is fully the result of Steve Jobs doing his job better than anyone, twice.
Yes but his job the second time around was to put the company in a position that it didn't need someone like him. Like most other companies of the Tech boom who also relied on that figurehead character.
So to think Apple will be any less of company also diminishes his work.
Sure It won't be the same, but it won't be radically different either.