Color selection on cars had a lot to do with the economic success or malaise of the times. By 1972, things weren't the greatest of times economically, politically, militarily, or nearly any other measure you could come up with. This certainly lead to a lot of cars being made in greens, golds, and browns across all makes.
Actually, I think it is what most people have bought. Whether it was the consumer driving the color choices or the manufacturer, I don't know. But as I drive my silver 2020 Hyundai down the street I see a whole lot of white, gray, silver, and black from all makes. I drive by the Cadillac dealer on a regular basis, all drab, boring colors on their lot. Now, across the street at the used car dealer there are a lot of colors, but that seems to be what they want to sell. "Boring" colors have always been sold in larger numbers. Perhaps the marketing folks know the real answer. Now, for my car. We weren't looking for a boring color, but bought the car because it was deeply discounted.
