It could happen sooner than we think! "Pre-fabricated" skyscrapers are already happening in New York City (though not to this extreme yet). So the mindset is already in place. Once 3D printing tech evolves to work better with metal and casting - we'll be off to the races.
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I wasn't aware that they already were using that technique in NY. Things certainly happen quickly once an idea or tech gains momentum on a wider scale, and 3D printing is really catching on at the moment.
Another thing I see catching on at the moment, is the construction of energy efficient houses and buildings.