My parents place (in New Zealand) is similar, the only lawn they have is the mandated patch between the road and the footpath, and a 5x5 m patch out front, which is more ornamental than functional. Most of the back yard is decked.

It's great when you don't have any kids that need space to run around, and it's very low maintenance, but I suspect that they're going to run into issues when selling the place, there's not a whole lot of demand for a 4 bedroom house with no lawn, and the place isn't really laid out such that you could just replace the deck with a lawn.