Actually the wires don't scale down like the transistors do. I remember in graduate school taking VLSI circuit complexity theory and the conclusion was for two dimensional circuits the wires will end Moore's Law. However I've seen articles about backside power delivery and they are already using seven+ layers so the wires are going through three dimensions now. Copper interconnects were a one-time bonus in the late 90s and after that wires just don't scale down-signal delay would go up too fast. Imagine taking a city with all the streets and houses and the houses now become the size of dog houses but you can't shrink the streets they have to stay the same size to carry signals quickly!