I might get hung for this; but part of the genius of Jobs wasn't his knowledge of computers, but his lack thereof. He certainly knew a thing or two about technology but Woz (and modern day Apple engineers) know a whole lot more. That lack of in-depth knowledge led him to envision products that were outside the scope of ability. A lot of Apple engineers have mentioned him demanding impossible things, but he somehow drove and led them to do it anyway.
He wasn't a genius because he knew how to build it, he's always had fantastic engineers behind him for that. Really just because he had an idea of what the customer would want (even if it's not what they say they want. If you're an Apple user, surely you've had at least one experience where on-paper, it sounded awful, then you used it and the lightbulb went on and you said 'Oh wait, now it makes sense, this is awesome!"). Apple still has the engineering power that brought us all those great products. But I don't know that it'll ever have the drive or ridiculous scrutiny of a guy like Jobs.