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Why can't house prices be out of tune with salaries
They can't keep rising with respect to people's income because eventually you run out of buyers. If there's roughly one house for every five people, then you'd better make sure that the price you set to sell your house is affordable to people in the upper fifth of income scales, or else you are mathematically guaranteed not to have any customers. Now, it's true that the price of particular houses can get much higher, but they tended to be higher in the first place. Housing isn't exactly an efficient market, but for the most part you have to pay for the house that you get, or else someone else will outbid you. An individual area might, temporarily, buck these trends because it suddenly becomes popular and there are a lot of extra buyers putting money on the table. In the long run, someone is going to build for those buyers, even if it means moving up the chain from enormous rural lots to suburban single-family homes to low-density garden apartments to residential towers.