Google’s wow factor is still at large — this time in a self-driving car that’s tootling about California in a series of test runs. It’s easy to get carried away with the dream of a personal (albeit automated) chauffeur and the implied robotic “get out of jail free card.” The inebriated and textholics among us — and possibly speeders, light runners and the accident prone too — are relishing the thought. But is this dream likely to blow into reality — or just get blown apart?