I guess there are lots of ideas from sci-fi that I'm disappointed that we don't have yet. As a kid growing up in the 70s/80s, I was very much into studying the space program, and thought for sure, that, by now, we would have at least one lunar colony, as well as a much more elaborate space station (or several). Alas, space travel problems in the 80s and costs put many of these things on back burners, but I feel a little cheated that we haven't progressed all that far in the last few decades. We went from putting satellites in space to the moon in such a short time, and then we seemed to stagnate in our pursuit of space conquer...I mean, exploration.
But hey, Trump plans on creating a space force, so maybe? No, then he'll just want to build a wall in space.
I also thought we would see cybernetic limbs more like what Luke Skywalker had in Empire. Maybe someone was worried that those crazy Telosians would take it too far.
And time travel. Seriously, what is stalling this?