Ahem. Didn’t several spaceship explode so far? Planes crashed… People died. And I think many US scientists have already switched to metric and many engineers have not. I bet they currently waste large sums of money for doing double the work when working together. Combined the sum of not switching is already a ludicrous amount of billions and billions. And the world isn’t getting less globalised. So true. It costs money to switch. And it’s probably yet another man’s pocket that money comes from. But the sooner you do it, the more money it’ll save you and everybody in the long run.
Edit: And after a while even your engineers might thank you for the easier calculations. And it’s not that a two-by-four has two by four inches anyways.