30 years ago I thought the change to metric was eminent. That within a couple years we would be all metric. At the time USA cars were Usually metric on the engine and inch on the body. About major factor that's changed in the last 30 years is that the cars are mostly metric now. That is because the cars have become more worldly.

I guess Chinese and 3rd World imports to this country have increased and they are metric? They are mostly "throw away" items and are not field repairable. So you7 do not notice the metric factor with them.