All the 'large areas of land' that people want to live in already have dense cities. This sort of ideas have been tried again and again, and it falls apart because people just don't want to move there.
Would you be enthusiastic about relocating if this was forty minutes away from Vegas in the desert?
People have and will move in the middle of nowhere if it offers them a way to make a living.
Worked in the U.K. Milton Keynes is 250k population which was under 50k 50 years ago.