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Interesting premise, if not exactly novel, but some could argue that, excepting some needed advances in medicine, we do have everything we need and we're still not satisfied. It comes down to this, will humanity ever design/invent something universally recognized as being perfect? I don't think so, I will still try to check out the book though.

But we wont need that many mechanics, probably just the really good ones (because there is now less demand))

The assembly process is becoming more and more automated. Some newer cars need to be taken to licensed mechanics, essentially squeezing independent mechanics out of the market.