Yeah, that's funny because the hoo-rah American Exceptionalist types are otherwise very conservative and dislike anything foreign, but they also adore the military, and the military has to be practical, and traditional units are so not practical.

I would guess that in time the US will adopt metric -- it will happen much faster if the American Century ends and other countries become more powerful. Since almost everywhere else is mostly metric, the US won't be able to go it alone anymore.