If there ever will be a world government, one which speaks for and works on behalf of humanity for the entire planet, or most of it, that system will not use miles, pounds, ounces, inches, and yards. That system will be a rational measurement system that 99.5% of the earth already uses.
This is how America denies the future, and therefore denies itself a part of that future.
My real nitpick today is with most weather websites which insist on using fahrenheit, and require setting change (on every, single, visit) to that of celcius. You suck. Assume that traffic from anywhere but the USA wants the metric system, and allow for a preference override. OBVIOUS.