We are also slowing down the rate we are making land desirable. During the 50s-70s we had massive success by creating suburbs that were connected to city centers. Due to how geography works, new suburbs are further from city centers and inherently less desirable. We have developed most of the geographically appealing regions of the US. The regions that can support more sprawl are seeing growth at a high enough rate that local infrastructure such as schools, roads, water, and construction labor is being stressed.

In the not too distant future we will have climate change that will displace people and a declining population that will reduce housing demand. Combine that with new building techniques/materials and in 100 years the housing situation will be totally different than today.