The point I'm trying to get at here, is that housing price is very location dependent. One of the determinants of how attractive a location is, is it's level of "amenity". Closeness to high-work areas is one aspect of amenity - and certainly a big factor in driving up the price in inner suburbs. If there was a greater degree of amenity in outer suburbs (better developed facilities, community hubs, good infrastructure) the difference in amenity between inner and outer suburbs would decrease - except for closeness (for a large number of people) to work. Having flexible work arrangements and teleworking could potentially reduce the impact of living a longer distance to work. I'm not suggesting that everyone should work from home, but being able to do it for a day or two each week increases the "liveability" of where you're at and makes those outer suburbs more attractive. The could reduce the price-pressure on those coveted inner-suburbs.
FWIW in Adelaide there has been lots of "backfilling" where medium-density housing is replacing older lower-density housing, and a many of those are well designed so they can provide for family needs while not gobbling up huge amounts of space.
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