The same way the Germans do, they save money.
Rising housing prices have played out the same across the Anglophone world. It's not sustainable as a means to get the lower classes into the middle class, because the higher prices rise the more debt they need to take on to join the game.
Housing is something people consume. It's durable, but so are cars and imagining them as being a gateway investment to the middle class because they will cost more in the future should be just as silly as for housing.