The housing ages as well. Old houses will be torn down and new builds will be regulated to maintain the supply low.
Demographic will definitely also have impact, but so much money is tied in REITs that some sort of bailout is inevitable in case the prices crash.
I have Dynalink DL-WRX36, running openwrt since day 0. Iirc it was 60 euro year ago. Everything works, wireguard too. No complaints. I believe there is openwrt stable build for it already, though I an still running snapshot as I am too lazy to update.