Thing is, so many have trouble finding someone to teach them, too many cannot find anyone at all.
The manufacturers of the Co-pilot simply filled a need for so many beginners. If someone invented a true auto-pilot that would do most if not all the work, the manufacturer couldn't make enough of such a device. Of course the users of this device would soon get bored of pushing a button to safely takeoff, do aerobactics and land perfectly every time. This would be to the benefit of the industry and more than likely, no one else.
The industry has a large market for things like "crash resistant" airplanes like the Aircore and the Co-Pilot, which is what the beginner thinks he wants, not what the purist thinks the beginner needs.
Take care,
CCR
http://www.kites.org/rc_instructors