I don't get why you Americans think changing is so hard.
At least your currency is already "metric" (base 10).
I'm old enough that I grew up with the imperial system for currency (pounds, shillings and pence) in Australia, then changed to dollars and cents in 1966.
You pick it up quickly enough.
We adopted metric units for everything else gradually between 1970 and 1988 and while I still sometimes have to mentally convert between the two systems, there are many imperial units that are now only a vague memory (how much is a rod or perch?)
There are short term draw backs to change of course.
I'm an electrician and still remember the hassle of using different sized screw threads and conduits, working out current ratings of the "new" metric sized cables, etc, but as I said before, you do get used to it.
These days, I love the metric system.
... and just because it was mentioned earlier in this thread ...
Our dates are written day/month/year, your convention of month/day/year is confusing at first glance to me, but I'm sure it would become second nature very quickly if we changed to your convention.
