Gold keeps increasing in value, the Mona Lisa too... Econ 101.
I've already partially answer this in another comment but if you think about it: I'd never buy a property with a 30 year mortgage if I'd known it'd lose its value. I'd be better or cheaper to just rent. But then if buying is a bad choice, because what just said, then who we'd be renting from?
I'm with you, that housing should be affordable. But it seems that everyone here forgets basic Economics.