I think this is interesting.

https://www.youtube.com/watch?v=_-GRrNzZVsc

So apparently they made a "Space Quest 7," but as it says at the end of the trailer (and now I know they weren't joking about this), Sierra's management wouldn't let them release it. Which is unfortunate, but given the time period it likely would've come out, it likely would have been a 3D game and, maybe it would have been a completely different kind of game like "King's Quest 8." It likely wouldn't have been their best game. Nonetheless, it remains disappoint that we don't get to see it because as it is, "Space Quest 6" ends on a cliffhanger that will never get resolved.