I'm answering this here instead of Reddit, because Reddit and I are Unhello at the moment...

Somebody asked "Does it depress anyone knowing that we may *never* grow into the technologically advanced society we see in Star Trek and that we may not even leave our own solar system?"

And my answer is "No, for the same reason it doesn't depress me knowing we will never be raptured into heaven, never discover the Secret City Of The Enlightened at the core of the earth, and never meet the Green Sex-Bee Maidens Of Venus."

Interstellar travel -- in anything resembling a form comfortable or even recognizable for modern humans -- is the stuff of science fantasy. We didn't know that then. We know that now. The rest of the cosmos is huge, unspeakably hostile, and utterly impractical to aspire for.

Let's just accept it and fix our own damn planet instead.