I've spent over 30 years in the construction industry here in the good ol USA. Would switch to metric in a heartbeat. Wish it would have stuck in the 70s.
I'm not sure about the kind of guys you've got working in the lumber yards in Arizona , but the ones around here would short circuit and explode if they had to learn metric. Half the the time they're lucky to get the boards within 2' lengths( that's .6096 of a meter,for you imperial challenged folks)of what you order loaded on the truck.
If we were to switch over tomorrow I'd be OK with it , it would just take some serious mental recalibration.I'd probably survive.