http://www.kurzweilai.net/the-law-of-ac ... ng-returns
The conclusion I reach is that it is likely that there are no such other civilizations. In other words, we are in the lead. That’s right, our humble civilization with its Dodge pick up trucks, fried chicken fast food, and ethnic cleansings (and computation!) is in the lead.
Now how can that be? Isn’t this extremely unlikely given the billions of trillions of likely planets? Indeed it is very unlikely. But equally unlikely is the existence of our Universe with a set of laws of physics so exquisitely precisely what is needed for the evolution of life to be possible. But by the Anthropic principle, if the Universe didn’t allow the evolution of life we wouldn’t be here to notice it. Yet here we are. So by the same Anthropic principle, we’re here in the lead in the Universe. Again, if we weren’t here, we would not be noticing it.
Let’s consider some arguments against this perspective.
Perhaps there are extremely advanced technological civilizations out there, but we are outside their light sphere of intelligence. That is, they haven’t gotten here yet. Okay, in this case, SETI will still fail because we won’t be able to see (or hear) them, at least not before we reach Singularity.
Perhaps they are amongst us, but have decided to remain invisible to us. Incidentally, I have always considered the science fiction notion of large space ships with large squishy creatures similar to us to be very unlikely. Any civilization sophisticated enough to make the trip here would have long since passed the point of merging with their technology and would not need to send such physically bulky organisms and equipment. Such a civilization would not have any unmet material needs that require it to steal physical resources from us. They would be here for observation only, to gather knowledge, which is the only resource of value to such a civilization. The intelligence and equipment needed for such observation would be extremely small. In this case, SETI will still fail because if this civilization decided that it did not want us to notice it, then it would succeed in that desire. Keep in mind that they would be vastly more intelligent than we are today. Perhaps they will reveal themselves to us when we achieve the next level of our evolution, specifically merging our biological brains with our technology, which is to say, after the Singularity. Moreover, given that the SETI assumption implies that there are millions of such highly developed civilizations, it seems odd that all of them have made the same decision to stay out of our way.