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I doubt that the rising difficulty of energy extraction has anything to do with population leveling and decline. For advanced economies, it's the social changes that allow fewer children or disincentivize them. These were likely enabled by cheaper energy in the first place, but if the energy remained easy to extract they'd still be in motion.

Rising housing prices is a very direct result of pumping out more people and it has maybe a little to so with fertility rates.

Who wouldn't want the cost of rent to go down? Rent-extractors, primarily. Many fewer of them then renters, so this seems like an economic good.

That said, the comfortable carrying capacity of the Earth for human life (and all the other things still surviving with us) seems to be far less, so building systems to operate well under contraction, and working to contract to some rough level and the level off with a new system, seems prudent for the long haul.

Rising housing prices can co-exist with country population decline. Jobs (at least in western countries) tend to be more and more concentrated in large cities. So people move there and in combination with artificially limited supply (zoning and other laws) prices skyrocket. They decline far away from these cities/ regions but no one cares because there are no jobs there.
"As William R. Catton Jr. pointed out trenchantly many years ago in his book Overshoot, this is the situation the human population of Earth is in just now. The invention of fossil fuel-powered technologies and the breakneck extraction of fossil fuels that followed provided the industrial world with a resource base equivalent to ten spare planets. That was why population figures started rising in the nineteenth century and went into overdrive in the twentieth: all those additional resources temporarily boosted the carrying capacity of the planet to levels never before reached, and allowed our species to experience an immense population boom."