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I live in Canada where everything is metric. Contractors still use feet and inches. Concrete people talk about how many "yards" they are getting delivered (but the slips are in m³ – never figured that out).

I'd like to see the US switch as well, so that we can switch to 5x dimensional lumber

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The Canadian experience is probably the short distance from the USA. Contractors in metric Australia use millimetres. If mm get a bit ridiculous then we use metres. The translation between the two is simple (1m = 1000mm). Context is usually enough to know which unit is being used.

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