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.

Such a pessimist you are! Self destruction need not be inevitable. We are, it seems to me, more likely to be the victims of an extinction level event, such as the impact of a massive asteroid, than our own folly.

And even natural destruction might not be the way of all beings that have evolved to a given level of advancement. If our galaxy has more than 300,000,000,000 stars (or suns), most with orbiting planets, and the observable universe has, according to current NASA estimates, more than 100,000,000,000 galaxies, each with billions of stars, it would seem likely that more than one species in our universe has figured out how to survive, even beyond the life of their sun.