Consider this image taken by the European Southern Observatory deep into the universe. Those aren't stars. They're galaxies. Tens of thousands of them. Each containing billions of stars. Even if earth-like worlds are one in a billion, there must be tens of thousands of earths in this photo. There is no way that there isn't intelligent life somewhere out there.
To those who say intelligent life elsewhere is too unlikely, I say you're just not capable of grasping just how huge the universe is.