CaptBubba,
actually America has come a long way to convert to the metric system.
automobiles now use metric engines. and cars which are made overbroad (like many Fords) use metric bolts. ah, but is it British metric or Japanese metric?
in Puerto Rico the metric system is used, especially for road speed signs, distances and gasoline measures. yup, kilometers and liters.
headphones already espouse 30,40,50,33 mm drivers and 3 meter cords. (at least those not made in Amercia).
America will take a long time converting to metric distances and metric speed signs. businesses which hope to do exchange goods with foreign countries have already made the tool conversion. you think Champion spark plugs only makes American thread sparkplugs? and the last i heard, tyres went metric a long time ago. the American truck may be the last holdout.
planes and boats use knots. but railroads are slowly changing over when new track is laid (so long as it's local). maybe Americans feel that if we change to a metric speed system we'll have to drive on the other side of the road. who really knows?
how do you measure lumber in the metric system? somehow i can't see a carpenter being able to not ask for a 2 by 2. (have you noticed that a 2 by 2 isn't really a 2 by 2?, 3x3 isn't really 3" by 3". etc.?)
how do you measure property? acres will probably take the longest to convert.