Baby boomers have started retiring and a lot more will follow.
Many of them will be in Auckland. Not all of them will want or need to stay there.
These mobile retirees could sell a home there and buy something at least as good for a lower price elsewhere.
Selling up and shifting out would take some of the pressure off the housing supply in Auckland and add to the population of smaller towns and cities which would welcome inward migration.
The difference between the price gained for the house sold in Auckland and one bought elsewhere would give the mobile retirees money to spare to enjoy a less frugal retirement.
This won’t make housing more affordable by itself, but add it to other measures and it could help.