I don't think that is a valid analogy. True, quality and ease of use
have gone up dramatically, but:
* that is mainly the result of fierce competition (and environmental
regulations which have drive manufacturers towards high-tech solutions),
while today's world of information technology and services revolves
about a few de facto monopolies, lots of hype, and a complete absence
of regulations.
* Cars have different features that fit various needs, and I guess
most people select the car they will buy by considering the balance
of features and cost. Which is an entirely different approach than
buying the latest iphone because it is the latest iphone and even
if you don't need it.
* Before cars became a commodity they were the toy and status symbol
of the rich, not of 'car nerds' (although those exist as well).
* In most places, to be allowed to drive a car you don't need to
RTFM but you need formal training and to pass an exam. More so
if you drive something that's not your avarage family car or do
it professionally. In other words, even if car drivers may not
know much about the technology that makes their cars tick, they
are not the typical 'dumb user'.