Of course if you only own one share your portfolio could go to 0...it could also have rise 500%. Sharemarket is about spreading risk and the reason why people invest in the market is to spread risk between property real estate and cash. A good blue chip portfolio over the last 20 years will have risen around the same amount as property has over the last 20 years. I can find cases where people have lost 50% of their money in property in the last 10 years...for example a friend of mine bought some property in a mining town...the town was going to increase its plant substantially in 2 phases. He put all his money into buying a large property and putting accomodation on it...phase 1 went through and his accomodation was full...then the mine deiced now only would it not do phase 2 but it would shut down the operation completely....his land and accomodation was worthless. Moral of the story...dont put all your eggs in one basket and especially a risky basket like buying 1 speculative company.
Property will fall across the board over the next few years...the only way it wont is if rates dont rise....even then i think best case scenario is it remains flat.
To me evverything is pointing to a lot more rate rises and then a recession.