Considering that humans are the best propigators, manipulators and adapters in the world, you could project that if humans were writing 90,000 years ago, the world population would be 900,000,000,000 not 6,000,000,000. America would have been linked 85,000,000 years ago and we would be living in paved technological splendor!
"And the LORD said, Behold, the people is one, and they have all one language; and this they begin to do: and now nothing will be restrained from them, which they have imagined to do."