A few days before this metric discussion, I actually went out to three stores in NY trying to BUY a metric ruler or tape measurer and could not find one. I ended up coming home and having to convert U.S. inches to metric online, just to convert non-U.S. metric bass hardware measurement. I was trying to compare some to specs given on U.S. basses to metric replacement parts.
I do admit that metric measurements make a lot more sense...especially when our currency is already based on tens. I used to think we just didn't use it in the U.S. so foreigners would get frustrated and stay home...except our pals in Liberia and Burma (the only two other countries that still use our system)
But think of all the American classics that would be lost that have movie titles or song lyrics about "miles" or "inches" or "pounds." Maybe we just cannot change for art's sake?