What if nobody comes?

The following thought-provoking quotation is taken off the internet:

"The estimated population growth target for Sydney (1.1 million by 2031) is completely unrealistic and there is the danger that planning is done for assumed developments which can never happen. The result will be to upset the lives of many residents who are forced to move out of their homes to make room for high-rises which will become future slums. We can even have the situation that houses are demolished by developers but then the land is left vacant because finance cannot be found in the next financial melt-down."

The same concern applies to Hornsby Shire's Housing Strategy - if they rezone Beecroft and other precincts to 5-storey to meet government targets, and the Federal Government then changes the population prediction, will those rezonings be cancelled?

The same website make this proposition:

"The Federal government has appointed a Population Minister, who will research into the population carrying capacity of Australia. This process including public consultation will take
one year. Until this report is out, all activities in relation to Housing Policies should be suspended."