KymerFye,
Yes, long-term biological evolution certainly contributed much to intelligence. Yet a newborn creature is a remarkably blank slate. If that newborn is not allowed to interact with the world, it will never develop the nifty cognitive skills that we call intelligence (or even basic functioning). Indeed, the brain is so plastic that even lower level functions like vision are NOT hardwired into it. For example, if you prevent a kitten from interacting with the world, even if you show it moving images of the world, the kitten's brain never learns to see and the animal will grow up totally blind. What evolution has done is create a powerful adaptive learning system that is primed, but not preloaded, to learn vision, language, motor control, intelligence, etc. Indeed the system is so unspecialized that the system can reroute around damage and borrow neurons in unrelated systems (e.g. use the visual cortex to process auditory signals).
As to interest in creating "intelligent" computers, the cost (and value) of human labor produces a powerful economic, social, and personal incentive to off-load tasks from people to computers. Companies would love to replace their costly call center personnel with Dell servers (complete with Positive People Personalities from the Sirius Cybernetics Corporation). And, I'd bet that most people would jump at having a "personal secretary" that takes care of all the routine administrivia of daily life (taxes, bills, coordinating schedules, finding the right gift, responding to personal letters, posting responses on ET, etc.). It is then a small step to go from reactive, passive computer-based intelligent systems to proactive, autonomous computer-based intelligent systems. I would love a computer that automatically spots and resolves billing disputes with my phone company.
You are right about people becoming cyborgs. I know that my Psion 5MX is like the 3rd hemisphere of my brain. And you probably are right that a computer-augmented person will always beat a stand-alone computer. The interesting scenarios occur when the computer-augmentation side is given some autonomy to solve small problems by itself (e.g., resolve a billing dispute or make the "best" travel arrangements). Then the scenario starts looking more like the "personal secretary" concept than a cyborg.
As to whether machines start reproducing, that has already occurred. Software publishing, software piracy, and computer viruses are all examples of the reproduction of the "fittest" bits of code. The notion of machines physically reproducing seems less likely, although increasing factory automation at Intel and Dell brings that scenario closer to reality.
Thanks for the interesting ideas!
Trade well,
Traden4Alpha