There is very little to think about here. World GDP/World population is ever increasing. As such it should be obvious that sons have a better life than parents except in the presence of: 1- local conflict or 2- in the presence of a class that amasses of an unfair amount of resources.

We are clearly in situation no. 2 and these are exactly the periods in history where revolutions start. When the rich get so greedy they make people's quality of life decrease in a broad scale they invariably are tamed by violent uprisings.

http://www.wolframalpha.com/input/?i=world+gdp+%2F+world+pop...