How about Siri?
The iPhone was the next step in omnipresent computing. You always have your iPhone. It's two steps down from laptops (leap-frogging the tablet, which has come after the iPhone). The next step is either glasses with computer screens (kind of geeky), or voice-interface computers.
With a voice interface, you can shrink a computer down to the size of a wristwatch. Getting data out is a problem (display glasses? some kind of projector?) is an issue, but not insurmountable.
15 years doesn't sound crazy.