I'll convert in a millisecond.
I don't like the idiotic system based on gills, hogsheads, pints, fluid ounces, avoirdupois ounces, and other nonsense.
5,280 what?
Is this a bit of American superiority that I detect here in many of these comments?
Exceptionalism, sure.
But for most people it's simply conservativism at its purest level. Which means change occurs only for good reasons.
Where we have economic or academic reasons to involve ourselves with the French system of measurement, we do so. Gladly and without regret.
But where there is no compelling reason to change, there is a compelling reason not to change. There is no reason why a dairy farmer selling milk to local consumers needs to switch to liters instead of gallons. If there is a good reason (there's more pop in a 2 liter bottle than a 2 quart one) we switch.
It's really that simple. People in our culture use the measurements we have always used, or developed for the task at hand. They're organic. Being told to use something foreign for no good reason will always meet with resistance.
SD