You can't have a scientific consensus about something that we simply don't know anything about. If you ask a large number of cosmologists, astronomers, physicists etc. if there's intelligent life out there, you will be getting a large number of personal opinions and beliefs, that's it. At this point, it's just a philosophical discussion to have in a pub. Interesting and fun, but essentially pointless.
We don't know what is outside of the observable universe. We don't know how big the entire universe is. We don't really know how the universe works. Hell, we don't even know the solar system that well. I don't think we have true science that can estimate the possibilities of life, nevermind intelligent life.