Sure, I get that, and we already have dual labeling on a lot of stuff, maybe even most of the stuff. The problem there is that nobody actually reads the other labeling, so they are also not learning.
They need to go back to what they were doing before: First decide that we’re moving over so that mandates can be enforced.
Second, do what you were saying, and do dual labeling during the transition–but make metric most the prominent.
Third, educate kids in schools to use it (this already happens to a degree).
Fourth, launch massive informational campaigns to teach people how and why to use metric.
Fifth, step down the dual labeling gradually as more people are comfortable with the new units.
I expect there to be a long tail of non-metric units in use (see UK), but if we can switch more things over that is still an improvement. Heck, I’ll even take them just decimalizing and removing some smaller units (like lbs/oz).
The history of metrication in the US is as frustrating as it is an interesting read. It can certainly be done and many countries have shown it can be done, but it takes commitment and support from the highest levels.
Yeah that makes sense. And in a pinch (no pun intended), measuring your solids by volume or even just eyeballing it is good enough for a lot of cooking (baking is a different matter).
But let’s not forget that Europe was not always metric, either. They went through the same process. They had the same units (or similar units) as US has now, with a lot of the same quirks. That was the entire point of the metric system: have one consistent set of units. United States was onboard early for metrication, but backed out before it completed it, so here we are.