This ignores the world's giant pool of floating capital ravenous for returns that jumps on trends and amplifies demand by buying up what it thinks will have good resale or rental value.
I saw this happen in the area I grew up in recently. Some people I know who were struggling to gather a deposit saw their dreams of homeownership go up in smoke as they got consistently outbid on a series of properties by investors.
This would be a pretty harmless outlet of an for a glut of capital if A) land werent finite or B) land had not been slowly untaxed for decades.
Of the two, B is a more prudent way of making property prices sane again.