I was thinking 50+50 years, but ok 10+10 years is even better. I mean, if you do it gradually enough, the cost approaches zero, so is it worth "almost zero" to have a standard measurement system across the globe? Maybe?
Nothing stops us from enacting generous legislation mandating the switch to metric by the year 2125 or something. You'd have to have intermediate milestones of course, or everyone would just do nothing and wait until 2124 and then complain endlessly about how the transition is so costly and we can't possibly do it in a year, and so on.
But this is the USA, where we can't seem to do anything that takes longer than a quarter, and our entire country's major priorities change every 4 or 8 years.
Nothing stops us from enacting generous legislation mandating the switch to metric by the year 2125 or something. You'd have to have intermediate milestones of course, or everyone would just do nothing and wait until 2124 and then complain endlessly about how the transition is so costly and we can't possibly do it in a year, and so on.
But this is the USA, where we can't seem to do anything that takes longer than a quarter, and our entire country's major priorities change every 4 or 8 years.