Anyone who really wants a peek into our future should look at the history of Easter Island. Two great tribes once inhabited the island, competing in games for glory and status, carving massive statues along the coastline by arts we to this day still cannot figure out.
These two cultures lived in relative peace until natural resources started to run dry, then the wars began. No more fun and games, they killed each other off mercilessly, till years later, when discovered by European sailors, all that was left was a handful of degenerate stone age "savages."
Their once great cultures were devastated by internal strife and killing over wood and meat and water. They could have worked together to build ships to colonize other islands, but did not. Greed and ego were their downfall.
By the way things look, we really are headed in the same direction. Religion and nationalism and dwindling resources will breed more war, just as will the greed of quarterly profit margins. I fear mankind will continue to kill each other off at an ever increasing rate until some terrible natural disaster forces us to cooperate for our very survival. Unfortunately a lot of us are going to get hurt before we learn this lesson.