THERE is little doubt the long-running housing boom is over, but uncertainty remains about where property prices are heading. Nationwide reported a 0.4% fall in the average price in October - the first drop in three years. The building society is optimistic the market is on course for a soft landing but others warn it could be about to crash. David Miles, chief UK economist at Morgan Stanley, said a price fall of between 20% and 25% could not be ruled out.