The cost of converting to metric would be more than most people realize. Imagine having to buy all new metric measuring tools if you're working in a shop that makes parts that have to be measured. If I get a metric drawing in my shop I have to convert the dimensions so I can measure what I'm building. Digital measuring devices can be changed with a button but if you use tools that are not digital that's not an option. So many things in the tool and die trade were designed around our system years ago. Just look through a machinist handbook. If you want to use metric then be my guest.
The dumbazz gov't does that and I retire that very freakin' DAY!
