We're moving into a situation where the climate changes will force people from coastal areas, both poor and rich alike. We're still polluting and depleting the Earth at an alarming rate. Furthermore, the income gap between the rich and poor is widening. There seems to very little control, and where it does exist it's often more evil than where it doesn't exist. Besides all that we're still living in between nukes and nuclear power plants and those *are* going to blowup once in a while, if history has thought us anything. All these facts will lead almost certainly to renewed war and social instability.
Sure it feels cozy living at the current time (I say when 30% in NL, one of the richest countries in the world, has problems balancing their checkbooks). But I don't assume that's universal, and I surely don't think it will last.
One of the more likely scenarios for never having had any contact with a alien civilization is that they blew themselves up just a few thousand years after the first big scientific breakthroughs. One of the issues with globalization is that extinction will be global as well.
Then again, I'm going to ponder this over further behind a freshly made capucino.