Why? It seems absurd to me to only have a dwelling last for half a lifetime. This view seems to assume a disposable, consumerist logic, which seems at odds in my view both from reasonable use of energy and time and with a sustainable civilization.
Your average house in the city is going to get bulldozed after 30-50yr because in that time things will change enough that someone is going to want to develop the site into something else.
Your average farm house is probably a 200yr structure.
I've never lived in anything that wasn't at least 50 years old and usually at least 200 years old - so that seems very odd to me. Mind you, I appreciate different countries and cultures etc.
Next you will be saying that roofs need to be replaced every 10 years! ;-)
My wooden house was built in 1953 with a concrete watertight cellar serving as the foundation. The wood doesn't start until more than half a metre above ground. I see no reason why it shouldn't last another fifty years or more.