I see that you are saying you would simply sell the apartments instead now. What is the solution for (e.g.) new grads who do not have a down payment yet? Why aren't tenants currently pooling their money, purchasing the properties they live at and converting it to a Tenancy in Common?

I do not think prices will drop without a rental market. Prices might even increase because you are making the market much less efficient. It will also make building new units more difficult as there will almost always be a holdout in the building.