you can see from the link malandrew provided about American spending habits (in a sibling comment to mine) that Americans are spending considerably more on housing, on average.

I don't believe the surveys cover "high-income" housing, but they do show median / middle-income housing growing by the mid 2010s to roughly triple the 1970s square footage. Inflation-adjusted, that means lower cost per square foot.

But it's certainly worth thinking about whether the shift to much bigger housing has been an entirely positive one, or whether it has drawbacks.