What about Canada, we officially use the metric system. Kids are taught metric, roads signs are in kilometers, temperature in Celsius, but almost no Canadian can tell your their own weight in kilograms or their height in meters!
If the US ever went all the way metric, I think they'd still end up using all their legacy measurements for decades. Certainly the US letter paper size isn't going anywhere -- everything is designed for it. The chicken and the egg are both well established.
Most definitely. Even in the UK, where they switched to metric some time ago, imperial measurements can still be seen all over, and many papers still provide both Celsius and Fahrenheit measurements.
While it would be nice if we Americans were exposed more to SI (rather than just in science classes), I don't really think it's important that imperial measurements be abandoned. They still serve their purpose in everyday life, so there's no real reason to switch.
If the US ever went all the way metric, I think they'd still end up using all their legacy measurements for decades. Certainly the US letter paper size isn't going anywhere -- everything is designed for it. The chicken and the egg are both well established.