HDB must have sold the 10,000 units of unwanted flats by now. Today, despite some trying to talk up the private housing market, the numbers are telling, that many are unsold and the stock is growing. The developers must have built and continue to build on the premise of a 6.5 mil population. With this as a guiding principle, building another 50,000 units would not be a problem. But should there be a change of the master plan, many of these private units will be left high and dry. Then again, knowing that we don't meddle with market mechanism, we can still open the immigration door a little wider and the new arrivals will quickly snap up the excess in supply. Private developers are in such a privilege position and in land scarce Singapore, investing in properties is a sure win formula. This may be the reason why the 6.5 mil population target is unshakable. Too many stakes involved.