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I suspect that if interstellar travel were feasible, we'd have been visited by now. The trouble is the vast distances between star systems, or as Douglas Adams so aptly summed it up, "Space is big. You just won't believe how vastly, hugely, mind-bogglingly big it is. I mean, you may think it's a long way down the road to the chemist's, but that's just peanuts to space." Couple that with the dangers inherent in such a mission, the extreme costs such a mission is likely to incur, and the need to justify those costs to those who would have to pay them, and it seems unlikely that interstellar travel will ever happen. Robotic probes may perhaps one day be launched from Earth with an eye toward relaying any data gathered back to the descendants of the ones who launch them, or even to the scientists themselves if lifespans increase significantly, but I doubt we humans will ever make the trip ourselves.
I could be wrong. I hope I am.
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