You'd need to see negative TFR's (http://en.wikipedia.org/wiki/Total_fertility_rate http://en.wikipedia.org/wiki/Total_fertility_rate)(http://indexmundi.com/uni

You'd need to see negative TFR's (http://en.wikipedia.org/wiki/Total_fertility_rate http://en.wikipedia.org/wiki/Total_fertility_rate)(http://indexmundi.com/united_states/birth_rate.html http://indexmundi.com/united_states/birth_rate.html) to even suggest that most people aren't having kids. Sometimes, the obvious is exactly that.