[rayiner]

As they say, you can fit the whole population of the world onto Manhattan. That is, of course, besides the point.

Atlanta is completely unequiped to handle that population (infrastructure-wise). It's not even clear that building out that infrastructure at that density would be wise. It's costly to build infrastructure for a city as dense as NYC. The cost of the subway system dwarfs the cost of running water and sewage piping to suburb. It makes economic sense in NYC, because space is at a huge premium. That doesn't necessarily make sense for Atlanta, a city with no natural boundaries and surrounded by cheap land.