Sure, with all of the billions and billions of galaxies out there a few may have survived , but evolution itself may cause the downfall because any species that becomes intelligent is aggressive and destructive, The savage aggressiveness has been compounded in war machines millions of times more powerful than when we evolved as upper paleolithic hunter/gatherers. We evolved killing each other with rocks and then spears, now we have multihead H bombs to throw at each other from half way around the world. Bloody in tooth and nail hasn't changed. By the way, Stephen Hawlking agreed with my position. I think that it is probable that when intelligent species evolve they cause their own extinction and we seem well on our way to off ourselves.

And anatomically modern Homo sapiens were in Africa about 315,000[6] years ago, modern behavior about 50,000 years ago. It seems, in comparison to how long it took us to get to this point, like an incredibly short time to be now talking about extinction. Many species fitness have been tested and many species are gone, but some have been around for quite a long time. Either we survive our challenges or we do not. It is the survival of the fittest.