Capitalism relies heavily on the sales of necessities, so making necessities free could damage the economy. — GreenPhilosophy
It isn't just the "sale" of necessities; capitalism is all about making a profit on all of those necessities that people... need. Eliminating profit from capitalism wouldn't just "damage" the capitalist economy, it would destroy it. That's OK by me, but be aware -- replacing one economic system for a completely different type of economy is very difficult (because the profit makers in the old economy usually don't want to just give up making money.)
So, I watched the video on the concrete house. Quite interesting. These can be built on site where the house is wanted, right? And I suppose they fill the gap between the inner layer and outer layer with some kind of binding insulation to retain heat (or resist heat from outside) and strengthen the walls.
Instant houses can also be made by inflating a heavy balloon, anchoring it, and then spraying foam on it, followed by a layer of concrete stucco. After the stucco has hardened, openings for windows and doors can be cut into the structure.
There is an additional problem, and it's a big one. However unequal the distribution of wealth may be, and however unfair the uneven distribution of wealth may be, there are too many people in the world to provide everyone with a nice house, decent clothing, adequate food, good medical care, and so forth. Why not?
There are not enough resources available to do that for the current 7.3 billion - expected to be 9 billion before 2050. It isn't just that there isn't enough money -- there is not enough raw material, energy, unused good crop land, clean water, sewage treatment systems, hospitals, etc. to do it.
Not to throw too much ice water on your good intentions, but by the time your humane plan was put into effect (let's say it took 80 years), the world will be in very dire straits from global warming. Many coastal cities will have been ruined (that's where most people live -- along the coasts), crop production will be severely diminished, it will be too hot in much of the world to work outside all day, the weather will be far more erratic than it is now, there will not be enough petroleum left to power all this equipment, provide raw feed stock material, and power factories and farms. Fresh water will be in short supply and god only knows what old and new diseases we'll be dealing with.
In a nutshell, by the end of this century, we are going to be totally screwed.
Your heart is in the right place, but the times are going to be very, very cruel.
Is there a way around the global warming problem? Maybe. If we all stopped flying, stopped driving cars, reduced heating and lighting to a minimum, stop making, using, and disposing of any unnecessary material of any kind, all become vegans, learned to live without air conditioning and 72 degree heat in winter, and so on, we might be able to prevent the worst of the disaster. Everyone not driving, not flying, and becoming vegan is about as likely as the Blessed Virgin Mary showing up tomorrow morning to serve you breakfast in bed.