Pretty much the same was said when the mobile phone companies realised that they could send a short text message using the mobile phone system, and it was only when Bill Clinton made the military GPS system available to the great unwashed that we now have the situation where the world would struggle to function without it. Ditto Japans creation of a new industry by making domestic video recorders. Colour TV's ?. Who needs that apart from Pot Black :-) Smart phones ??. They'll never catch on.
*diesel* engines in *cars*, whatever next ?.