At work we make custom molded parts both to customer specification and our designs to their finished product. I don't recall ever seeing a drawing with metric dimension until sometime maybe in the mid '80s. Now more than half are metric.
Used to be too, drawings had dimensions like 12 5/8" that later became
12.625 with the advent of drawing programs, but now it is likely to be 12.62.I used to buy hydrauling supplies, hoses, etc from a local comapny. Whenw e go imported machines, they could not suppoy us. They told me "if it's metric, you're on your own" Five years later they were out of business, but my new supplier has everything I need.
I have to wonder where they will be in five, ten, fifteen years. Remember when the local gas station would not work on imported cars because they did not have the tools?