This is still far too off. Just look at how long time it took for Bitcoin to get released to get some attention. We are 10 years in but almost nothing has happened. 3D print house is a fantasy also that will take at least 30 years until it would take off mainstream. And we also have an overpopulation problem. People don't have time to do these things you need land and a bunch of other things. People will just rent and share stuff more instead. Most of places on this planet doesn't have that much free land to do these fantasy experiments on. Most live in cities.