The Netherlands has entirely the same wage decoupling, albeit not totally at the same scale. A simple test for this: look at what kind of salary you need these days to support buying of a single-family home. I can tell you: my parents did this on the support of 1.5 medium-low income wages.

Could that be because more and more people are trying to live in cities, yet housing is not growing as fast as it did in the last "let's move to the city" boom?

Yeah, cities are expensive. Outside the city you can still buy a house on a single income. Not a big one, though. Still, compared to the house my parents bought when I was 6, houses have clearly become a lot more expensive.