House prices won't fall by removing those things because theres...

House prices won't fall by removing those things because theres a housing shortage and record immigration and if the government creates policy to make investors sell their houses then the tenants will get kicked out of those homes and owner occupiers will move in, the tenant won't buy the house because he/she can't afford to buy and because investors have been chased away by the gov then it's likely the house investor will sell to one of the million immigrants that are arriving annually at the moment and then the poor old Aussie who was renting the investors house is now camping in the car or in the park.

House investors logically add rental supply to the market, without them theres less rentals available thus rents will rise because the demand rises.

Australia needs more housing supply for renters not less and therefore needs more house investors not less to bring down pricing pressures, one needs more supply, the other thing thats holding up house prices is the massive increase in cost of building a new one, construction costs have somehow gone up 45% or so in a few short years.