Do you dream of having a self-driving car in your driveway, ready to whisk you away at a moment's notice? You might have to keep dreaming for a while. GM president Dan Ammann tells Business Insider that he doesn't expect autonomous vehicles at dealerships until sometime "much farther in the future." You're more likely to see them used in ridesharing fleets at first, he says. GM clearly has a vested interest in that business between its partnership with Lyft and its own car-sharing efforts, but Ammann has some practical reasons for tamping down expectations.