First of all, it's not an accounting analysis, it's an economic one. For the most part what you say is correct in the long run if the market proves viable in the midterm, but that's a pretty big if. You can radically drop the unit cost of any widget by increasing production or spreading fixed cost over several different types of widgets, but if no one wants them you are screwed. I have no doubt that most of the industries you mentioned were subsidized in their infancy, the problem is that most of them still are.

Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats. H. L. Mencken