Metric usage and metrication in other countries
It looks as if it takes at least a generation to switch. And yes, our not switching does have some impact on why these other nations have trouble completely converting. However, the push for metrication in the US just isn't here. Even the government isn't willing to do what seems to be necessary, including pushing it and devoting the funding to it. We can't even get schools to agree to teach evolution and not to teach about God to their students and, in some extreme cases, Adam and Eve riding dinosaurs. A person needs to only look at what Texas school systems want to teach and do in fact teach in school to see how well trying to use our school systems to metricate our country would work.