With a trillion-dollar valuation, Nvidia is at the top of its game – will its reign last?

Everyone wants to be like Apple. The largest publicly traded company in the world, with a flagship product that prints money, and a cultural footprint that has reached world-historical importance: the 21st-century Ford. On a surface level, the companies that get slapped with that comparison are obvious enough. If you pump out well-made, slickly designed consumer electronics that arrive in a nice box, someone somewhere will compare you to the Cupertino giant. Dig a bit deeper, and there's more meaningful comparisons to be made. Apple isn't defined only by its style but also by its focus. A small number of…