I remember listening to that podcast and being quite annoyed by it. One of the protagonist's who was obviously in favour of sticking with imperial units kept smugly saying the US is already metricated. Comes across disingenuous as best.
The US rarely uses metric in it's popular culture. Weather reports are in Fahrenheit, movies almost always use miles and pounds. By any measure of cultural output that they export that I've seen (and Australia is a huge consumer of US popular culture) they do not use metric.
Temperature is a weird one, and shows the difference between 'metric' and 'SI unit'. Fahrenheit is neither, and for me is far from intuitive. Celsius is a metric unit, but it's not the SI unit, which is Kelvin.
Celsius certainly makes more sense on the human scale than the other two - the general public is familiar with 'water freezes' and 'water boils' - but it's a neat example of a metric unit not being the SI unit.
