In a word, unsustainable
The image depicted in the article - of dozens and dozens of high-rises, is typical of the mindset of the totalitarian, ecoterrorist, central-planner elites. How naive can you get?
High-rise construction requires immense amount of materials and energy to build and operate.
High-density living necessitates massive off-site agriculture and power generation.
High-rise units cost a fortune, and tomorrow's jobs will be fewer and pay less.
There is no need to concentrate people into megacities.