Surely it's slightly different to many markets because owners will have a good memory of what they have paid so will be very unwilling to sell at a loss. Only where the property is repossessed or their hand is forced would these reductions be realised.
Yeah, it can be a bit sticky in that respect, also in some cases they can't easily sell if they don't have much equity to use as a deposit on the new property or indeed have gone into negative equity.
Of course if you've got plenty of equity and are looking to upgrade then a drop in prices might be useful, you take a hit on your current property but you're paying a much lower price for the new one too.