I am amused at all the responses that say to stay with inch units.
Do you realize the rest of the world has gone metric? There are only 2 countries in the world still using the inch units, us and Taiwan. Everyone else has gone metric. Talking about being left behind???
Even England migrated from the English (Imperial system) to metric. Are we that resistant to change? Do we want to be known as a world leader or a country that is stuck in their own rut? If I were a foreign (metric) country, whyI would I want to buy a product made in these inch units? Would you buy a product that was made in Russian Cubits? Or some other system that your tools did not work on?
I work for a compnay that we are fighting hard (as engineers) to get into the metric system. If we migrated over to this system, our world markets would increase dramatically. It is like getting a divorce, initially it is painful, but in the end, you will be happy you did it.