hedwards: I probably should have worded that differently. The things that are popular enough to be worth having here are unlikely to be available. The things they could license are things that people probably wouldn't want to watch.
Things like the Twilight Zone and Outerlimits are still being shown on TV in the US. Not to mention that most, if not all of them have regional rights reserved that would have to be sorted out.
So, it's probably not impossible in the technical sense, but pretty close.
No, I understood you. I just thought those series (and similar productions) were forgotten or abandoned.
It seems that worthwhile shows fit a very narrow fringe, where they are not too profitable to be explored elsewhere, but profitable enough to justify the "shelf space" at GOG.
And that is ignoring the regional rights, as you mentioned.
That leaves Public Domain and new (indie?) productions as the most likely possibilities.
Big Buck Bunny? Kung Fury?