Pretty funny, but that's what kind of logic you need to follow in order to not make a fool of ourselves! I personally think this will never happen, or maybe in a million years or so, but who knows! The Universe is vast! Somewhere, somehow, a civilization may be 10 billion years old! In that kind of time frame, traveling across the Universe in a heartbeat would not be such a big deal. If it's possible in the first place. What I don't understand is: Why they should allow us to exist? Other reasons than experimenting or studying how alien life evolves I clearly don't see! If instead us humans would explore the space and we would encounter another alien species, far behind us technologically, we would have no hard feelings exterminating it! So I guess we need a lot of luck and to hope that a wise alien species would visit us!