>> Such a system would be relatively easy to put in place he claimed, saying all you'd need would be a radar system, cameras with image recognition, and long-range ultrasonics.
Thats a particularly clueless statement. The items he listed are all just sensors. They don't make decisions any more than your ears or nose do.
He forgot the part that actually takes that collected data and makes good safe decisons based on it, and THATS the difficult bit that takes all the time/money/development effort you've got and more.