When I opened your post I thought you where going to speak about the power of blockchain technology to kill the banksters, but you surprised me when you talked about the debt with mortgage.

I completely agree with you, this houses are only starting too.
What I think is that people want to be free and for that having a house in the same place forces them to be in the same country all the time. For that same reason houses that have low cost will start to be adopted and this looks like a good solution.

I heard about this type of houses being built in the Netherlands, houses that float so they can have space enough for all their population.