From an economic standpoint, the rest of the world is a big enough market so that it's worth supporting too. And everybody gains when markets join.
About tooling, yeah that's bad. But everybody has 2 sets of tools all over the world, because both US and rest of the world are big markets. A transition won't change a thing, the only thing that changes is that a few decades from now, everybody will stop needing one of those sets.
Paper is also already a nightmare. All equipment supports both ISO and US standard, and is more expensive because of that.
Constuction aparell is always weird. Your 36" doors are certainly not exactly 36" wide, as metric 90cm doors are not exactly 90cm wide. At least here (at Brazil, thus metric) there are several different sets of sizes to choose from, because some people want bigger doors and windows, other people want smaller ones.
I think you overestimate the costs at the US, and underestimate the benefits.
About tooling, yeah that's bad. But everybody has 2 sets of tools all over the world, because both US and rest of the world are big markets. A transition won't change a thing, the only thing that changes is that a few decades from now, everybody will stop needing one of those sets.
Paper is also already a nightmare. All equipment supports both ISO and US standard, and is more expensive because of that.
Constuction aparell is always weird. Your 36" doors are certainly not exactly 36" wide, as metric 90cm doors are not exactly 90cm wide. At least here (at Brazil, thus metric) there are several different sets of sizes to choose from, because some people want bigger doors and windows, other people want smaller ones.
I think you overestimate the costs at the US, and underestimate the benefits.