I suspect that, when studies are done with cooler reflection, the causes of the swing in house prices will be seen as less a consequence of monetary policy and more a result of the emotions of excessive optimism followed by fear experienced every so often in the marketplace through the ages.
To some extent, too, the amplitude of the housing cycle was heightened by the newness of the subprime market, the fragmentation of regulatory oversight responsibility for that market, and the complexity and opacity of the newer instruments for transforming and distributing risk. Low policy interest rates early in this decade helped feed the initial rise in house prices.