I'd rather push for population control. I don't want to live in a world where humans have to live like insects, crammed into giant hive cities.
> However, if we're a little more clever with how we allocate and share our resources, we can scale up standards of living in a sustainable way - urban transit and a fleet of automated electric taxis, community pools, zero energy building techniques and mixed developments, and so on. This just requires that we head back in the direction of sharing things (social democracy) and away from economic individualism (neoliberalism).
I'd rather use cleverness to sustain our quality of life with smaller populations. If we had your sci fi utopia, we could have a population of 1 million total humans, each living like a king. I don't understand why you want to use sci fi magic just to have everyone live like an ant in a box