Horseshit. Homes built in 1946 are selling for millions of dollars, even if they're going to be torn down and rebuilt for marginal cost. You're not buying a house, you're buying the land and taking responsibility for everything on it.
And even then, the lumber you get out of such an old house is quite valuable virgin oldgrowth, a better quality product than you can buy at a lumber yard today.
And, to pick a nit... comparing the median income to median house price is an examination of relative price, not absolute.