I well remember when the schools were pushing the metric system in the early 1960's; I loved it. It was the conversion back and forth to English system that was a bear.
Then in the late 1960's, Uncle joined me, and a two year vacation to Japan commenced. There we lived metric. There is a huge difference in thinking in metric rather than thinking in English and converting to metric.
Then when I returned, the car manufacturers started using metric. I spent thousands of dollars in tools in both metric and S.A.E. so I could work on everything.
The silver lining (if there is one) is for those of us that tune carburetors, and find there are many sizes of drill bits (for drilling jets) that don't come in any of the 3 S.A.E. drill sets (fraction, number, letter). Think fractional metric. Most of the inbetween small sizes can be acquired in fractional metric (of course, you still have to convert

) So I still get to utilize some of the metric stuff.
As Bart mentioned, the cost of conversion to metric is too great. Unfortunate, but true.
Peggy - great that your daughter has a vocation she really enjoys. She will never have to "work" a day of her life!
Jon.