V60 and V90 are station wagons, you're thinking of XC60 and XC90. The reason wagons aren't offered in the US is because the consumers didn't buy them, which is my point. When given the choice, they chose the bigger, heavier option because the extra cost of using more resources weren't high enough.
I actually believe hatchbacks are making a comeback. Toyota just introduced the Corolla hatchback in response to the new Civic hatchback. Jaguar has a new XF wagon. Porsche made the Panamera Wagon.
I'd like to believe all these automakers aren't going through the trouble of safety testing and certifying wagons without demand being there. The hatchback version of the Golf/Mazda3/Impreza seem to be selling well enough.
