Do you remember that he replaced them with zip drives because that was going to be the future? (And also because you could charge a premium for them?) Floppies did die out a few years later, but I'm not sure that the mac getting rid of them led to their obsolescence at all.
Jobs is an absolutely brilliant product architect. He has an unmatched vision for how things should look, and how things should work...and most importantly, he does not suffer from the engineer's need to add everything possible to a device simply because you can. It takes a lot of discipline to do this (as it is so easy to do wrong), and the highly unusual ability to see the forest despite the trees. (Although he's not God and occasionally takes this too far, i.e., 2d mouse button).
More importantly, Jobs is in the happy position of living long enough for technology to catch up to his design ideas: while the NeXT computer *was* ahead of its time, it also cost $10,000 in 1990. Contrast that to iPod, iPhone, iPad, etc. All of the requisite technology for these products already existed, but Jobs was the one to see that current manufacturers didn't understand at all what should be done with the technology, nor how the software should be designed that runs the technology. And that's his real genius.
PS - The Ford quote is apocryphal. Ford didn't invent the car; they had been around for 30 years when he opened his first plant. Ford's innovation made cars much cheaper, and simultaneously enabled him to produce enough to meet the demand. But if Ford had asked his customers what they wanted, they would probably have said "cheaper cars." Which was what he gave them. (Followed by "cars in a color other than black," which he did not give them.

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