I think that is a good thing though. Honestly, if they got to the source of that signal or whatever it would probably be a bit disappointing or just lame. Its like Shepherd Book in Firefly. The reason he was so cool was because he was such a mystery.
I also think it makes humanity seem small and the galaxy seem so big again. Like in old SG-1 before they had space ships and were all geniuses at using alien technology. That was really cool. Alien things should be hard to deal with and cause problems and stuff. It makes for much more interesting stories.