By 2000, wood, brick and stone are ruled out because they are too expensive.

Waldemar Kaempffert : Science writer
In 1950, Popular Mechanics printed an article forecasting what everyday life would be like in AD 2000, including the prediction that metal, plastic and clay will have replaced wood, brick and stone as materials for construction.

Waldemar Kaempffert, "Miracles You’ll See In The Next Fifty Years", Popular Mechanics. Feb 1950.