@Lucy Duke I had to look up the Mars Orbiter, but yeah, same problem!
That makes it sounds like a nation should only change because most others do so. Should the motive really be about being in the in crowd?
If it got implemented, there would still need to be a one time conversion of everything (ie I'd need to convert my home size from ft^2 to meters^2), but after that the need to learn to convert would become irrelevant because the old way would be completely gone.
In the long run though, is either changing to metric or staying of any importance to someone with a 4th grade knowledge of arithmetic? How difficult is it to multiply by 0.621 or 1.6? Is it so hard to cooking accessories that have both systems on it?
Well, yes and no. Theoretically, we with a basic education should be able to do a conversion of units all the time, but do we? The human mind functions a lot with guessing and estimating, both of which normally we tend to do in miliseconds. We compare things while driving for example. If you have ever driven a car in England or Australia or vice versa you will understand just how strongly we are set in our ways. While I drive normally here, I do not think a lot, most of the movements come automatically, while if I drive in London, I have to be careful and alert all the time...
That is not directly linked to the criticism above, but here it comes: When it is so easy to make a mistake, should we not eliminate that possibility at all if we can? Murphy's Law after all.
Go back three centuries and the difficulties the French had in introducing the metric system and kicking all the different ones out thus creating a bigger market, bigger efficiencies and less mistakes in translating = less trouble. Also true for currencies and a central clock time btw. Just think of the trouble we would have if we didn't have time zones a la Greenwich.
Thus yes, the Americans need to follow the rest of the world in that aspect, as the rest of the world has followed the Americans in a lot of things just because they are powerful (f.e. New York Stock Exchange Rules, and look where that has led us). So, for once, be less stubborn, because we will not cave into your archaic measuring system.