OK, a fanboy from the Arduno cult has been heard from.
Back in 1979, Milton Bradley introduced the Big Trak. This was the first mass-market battery-motor-wheels-CPU toy 'bot. Since then, there have been more machines in that category and slightly above it, like Lego Mindstorms.
It's been three decades since the Big Trak. There hasn't been much progress above that level in mass-market devices. A Roomba is only slightly smarter than a BigTrak. Mobile phones, on the other hand, have advanced somewhat since the late 1970s. R/C toys have become much better, but most of that reflects improved batteries, and the good stuff is still at a rather high price point.
There's a new BigTrak from 2010. It has an optional camera and a WiFi connection, and will connect to an iPhone. It has the basic hardware to be an intelligent autonomous vehicle. But it's no smarter than the original BigTrak. If you want something as dumb as a BigTrak, you can buy one of these. No assembly required. Ages 6 and up.
Here's what's possible today at the hobbyist level: an autonomous paintball robot. Runs a maze and hits targets. Uses a Kinect as a sensor. Has 2D SLAM; builds a map of its environment. That's what new products should be doing.