Yes, true. But Jobs went on to describe how he would build one and gave estimates on what it would take to do so and how it would work. Unfortunately, Apple tossed him out of the company and set him back on his plans, until he later returned to Apple. The end result was the iPad and iPhone (he was actually working on the iPad before the iPhone, but released the iPhone first).
Yep. Kay is more of a dreamer-type visionary. Jobs was more of a okay-make-it-happen type visionary.
The world could use more of both, working together.