Tesla Motors defied the skeptics again with its first 10,000-car quarter, and at the rate it is going, it is only about a year away from being a major player in cars. Tesla has a lot going for it as it tries to double its volume again, and I’m not talking about abstractions such as confidence or momentum. It has designs that won’t need more than incremental adjustments. It has enormous manufacturing capacity, at least in terms of factory floor space and assembly robots. Skeptics point to the competition that will come along in electric cars as soon as Tesla demonstrates success on a large scale, but Tesla has a ten-year head start and a better engineering process than you can find in Detroit. It will take years for other manufacturers just getting started with electric cars to achieve the same degree of refinement.