I think laws need to be changed to make owning (not building) real estate unattractive as an investment. Something like wealth tax (every year you pay X% of the property value) aimed at real sector specifically, with very progressive structure / exceptions for single homeowners.
That should help in a lot of cases. Then it also depends on the demographic development - many places will actually see drop in the population in the coming decades, that should make housing cheaper. Areas with growing population - there it may not be possible to stop the price increase completely.