After the initial burst of media induced hysteria things would quickly settle back to normal. After all, we have been fed a diet of "aliens exist" fiction and propaganda for years, so people are now completely comfortable with the idea.On the other hand imagine if there was an urgent announcement that scientists had found definitive proof that aliens did not exist, and that the only life in the entire universe was on Earth. That would be a truly astonishing revelation, that very few people would be prepared for. People would have to open their minds to this incredible new discovery. Once again, after the initial media induced hysteria (the media is big on hysteria), things would settle down, but now there would be a complete shift away from antiscience. The "new age" movement would lose all credibility. People would have to come out of their fantasy caves and embrace reality. We might even see society move towards a new rationalism where real science and real logic is king.Anyway there are some thoughts on the subject.Cheers!