I'll have you know metric actually already is the de jure measurement system in the US. US customary units are just used out of tradition. As far as the government, industry, and academia are concerned, the US already is a metric country and has been for a long time now. Some of the public, particularly the older generation may not understand it, but everyone who went to school post-Carter administration had to learn the metric system so most people have at least a passing understanding of both.
>It's still a developing nation at this point
That's a little dramatic, but that certainly does apply to some places in the rural South like Louisiana, and arguably some of the territories.