House prices won't crash. At worse they will "bump along the bottom", which in real terms is as good as a reduction.
These sites and analysis are all very good, but they deal with just one "what if" scenario.
Of course, all civilisations eventually fell in one way or another. A reversal is due, but in what form it will take - who knows.
I read an analysis recently which suggests Britain is changing, but has a few hundred years left in it yet