"If property falls back to the long term average of keeping up with wages growth, and that was 3%PA, it would take property 20 years to double, and it wouldn't be worth any more in real terms than what it was 20 years ago. "
Even if it just did that I would be more than happy - as any debt originally taken out to purchase the property would be significantly less due to inflationary effects. So at the end of the day you would have a nice income producing asset!