Again, those are just assumptions you make without further understanding of a great number of things.

If you looked at US infrastructure and based the population we should have on how a developing nations population works, then you'd come up with a number like 750 million to a billion people... because 6 to 10 people live in a house, right? FYI, average US household is 2.5 people.

Simply put you cannot make any of your assumptions without more knowledge.