Alco
Monty Hall's Favorite Contestant
Posts: 760
Statistically, I certainly believe that it's highly probable that other intelligent, humanoid-like societies can exist. We are learning that most stars have planets and of the ones that do, most probably have at least one planet that is capable of supporting life. We are also finding life in places where we wouldn't expect to find it. As Jeff Goldblum's character said in Jurassic Park, "life, uh... finds a way".
I think the real question is, do you believe that intelligent, humanoid-like societies exist now. Further, do they exist within a proximity that would make contact likely. Unfortunately, those two additional variables extremely constrict that possibility. I'm not saying that it's impossible, but it makes it statistically significantly less probable.
For example, one unfortunate possibility is that (because we are actually very late on the 'intelligent, humanoid-like' scene), the other highly developed life annihilated each other over scarce resources 100's of millions of years ago.