I mean the housing market. I'm already seeing Bitcoiners transition to paying for food entirely with Bitcoin via local producers (Farmers markets). Though we need better infrastructure for this to market your farmers market Bitcoiner to as large of a market as they can handle. Now as we go through the list of things that need to be paid for in Bitcoin to get off FIAT, we look into housing.
Consider rent to own: https://www.renttoown.org/
We already have retailers who will sell houses to Bitcoiners, but now lets look at the possibility of those same Bitcoiners then selling their houses to newer Bitcoiners via rent to own at a profit margin.
As always, if you have other ideas on how we can build businesses around replacing FIAT for everyday things, I'd love to read all about it.