We have virtually converted to metric. Most of our manufacturing uses metric dimensioning. The medical and scientific community has been metric for decades. The automotive industry, likewise.
I suspect that the building trades will be the last big holdout. Much of this has to do with legacy systems. With "2 x 4's" and 4' x 8' sheets of sheet products having been standard sizes for many decades, the majority of our residential structures are built to those standards. Stud or joist spacing at 16" or 24" fits nicely with 4"' x 8' sheeting. Any repair or remodeling work using newly adopted metric products would cause match up issues.
As I look at EU lumber (timber) and sheet goods, I see a hodge podge of different sizes catering to the older legacy structures and new building. Far from the metric order they would have us believe. Looking at sheet goods, I saw 1200mm x 2400mm, 1220mm x 2440mm, 1250mm x 2500mm, and 1500 x 3000mm.
Just specifying dimensions in the metric system doesn't mean that you have converted, IMO. We could specify our 2 x 4's as 38mm x 89mm too. I, for one, prefer to deal with the inch measure where I can work out all my cut lines and allowances without having to carry a calculator.
It's a different story when machining metal. My CAD, CAM, and DRO's don't care whether I'm working in Imperial or metric. Nice, whole numbers aren't as convenient as they once were. I have worked so long with both systems that the conversion from on to the other comes fairly effortlessly. I design and work in either, the choice depending on materials and tooling at hand.